Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 120008: Please please help me with this problem!
This problem is about using Point-Slope Form and asks to graph each equation. What is ? i need to know what is the slope and which is the rise and run.
I think that might be like; slope= 0, and rise over run = -3 over -2. I'm really confused i think i know how to graph the equation.
Thank You SO much
Click here to see answer by stanbon(75887)

Question 120011: i need to find the solution to these system of equations by substition method.
y=4-3x
y=2x-1
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Question 120020: Am I asking this correctly? The directions say: Use the substitution method to solve the linear system.
Problem:
1. y = x + 2
2x + y = 8

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Question 120015: i need help sloving this system if equation by substitution
2x-2y=4
x+3y=1
Click here to see answer by jim_thompson5910(35256)

Question 120133: I don't really understand how to do the substitution method.
How would you answer
Click here to see answer by jim_thompson5910(35256)

Question 120131: 7x-y=10
x=2y-6
I have to solve this problem using substitution and I don't understand and I'm really confused could someone please help me?
Click here to see answer by jim_thompson5910(35256)

Question 120129: 2x+3y=24
y+7x=46
I have to solve this problem using elimination and I don't understand could someone please help me?
Click here to see answer by jim_thompson5910(35256)

Question 120128: 6x+3y=-2
9y+10x=-2
I have to solve this problem using elimination and I don't understand this at all could someone please help me!
Click here to see answer by jim_thompson5910(35256)

Question 120188: Use substitution or elimination to solve each system of equations. Please explain.

7. 2x + 5y=16
5x - 2y= 11
Click here to see answer by jim_thompson5910(35256)

Question 120130: 3x-4y=-1
11y+2=13x
I have to solve this problem using substitution and I don't understand could someone please help me?
Click here to see answer by ankor@dixie-net.com(22740)

Question 120332: USE THE SUBSTITUTION METHOD OR LINEAR COMBINATION TO SOLVE THE LINEAR SYSTEM AND TELL HOW MANY SOLUTIONS THE SYSTEM HAS. THEN DESCRIBE THE GRAPH OF THE SYSTEM.
24) -7X+7Y=7
2X-2Y=-18
25)2X+4Y=-8
2X+2Y=-4
26)2X+Y=-4
4X-2Y=8
Click here to see answer by checkley71(8403)

Question 120342: which equation is bets use for the problem y=-x+6 and x-2y=-6
Click here to see answer by jim_thompson5910(35256)

Question 120346: elimination substitution, or graphing best fits 2x-2y=-4 and y=2
Click here to see answer by jim_thompson5910(35256)

Question 120386: I got this as homework, i'm in grade 5, and I just need some help.
A1.Express Each sentence as a mathematical equation.
a)five times a number is equal to fifteen.
b)Twice Mary's age is thirty.
c)A number increased by seven is equal to thirteen.
d)A number decreased by two is equal to eleven.
e)Six less that a number is equal to fourteen.
f)Bill's age two years ago was ten.
g)Nicole's age five years from now will be twenty-one.

A2.What is the coeffecient of each term?
a)5w
b)-3w
c)-7y
d)m
e)-4.3m
f)-6
g)-m
h)3/4m
A3.Solving
a)x^5*x^7=
b)a^9/a^5=
c)y^12
Click here to see answer by heidi(17)

Question 120422: How would I solve 4a - 7b = 13
2a - 7b = 3
Using elimination?
Thanks!
Click here to see answer by jim_thompson5910(35256)

Question 120374: I'm taking an Algebra 2 exam tomorrow and trying to review as best I can but I can't remember everything we've gone over in the semester. I was just wondering about parallel equations. How can you tell that the equation is in fact parallel so you don't have to work it all out and notice it once you see it? Thanks.
Click here to see answer by ankor@dixie-net.com(22740)

Question 120439: Several students decide to start a T-shirt company. After initial expenses of $280, they purchase each T-shirt for $3.99. They sell each T-shirt for $10.99. How many must they sell to break even?
Click here to see answer by josmiceli(19441)

Question 120508: solve the system by addition and substitution methods
4x-4y=-8
y=2+x
Click here to see answer by jim_thompson5910(35256)

Question 120532: Please solve the system by addition and substitution methods.
3x-y=1
3x-y=2
I can determine that by looking at the equations that there is no solution. But I can not figure out how to do the math to prove my theory.
Click here to see answer by jim_thompson5910(35256)

Question 120563: The sum of two numbers is 50 and their difference is 18. Find the numbers.
Im so confused could someone please help?
Click here to see answer by jim_thompson5910(35256)

Question 120563: The sum of two numbers is 50 and their difference is 18. Find the numbers.
Im so confused could someone please help?
Click here to see answer by solver91311(24713)

Question 120556: The length of a rectangle is 20cm greater than its width. The perimeter is 360cm. What is the area?
I really don't understand this, could someone please help?
Click here to see answer by tutor_paul(519)

Question 120555: Last year Sue was three times as old as Pablo. Next year she will be twice as old as Pablo is. How old is each now?
I don't understand this at all.): Could someone please help me?
Click here to see answer by ankor@dixie-net.com(22740)

Question 120557: Sally has $21.40 in dimes and quaters, for a total of 100 coins.How many of each kind of coins does Sally have?
I dont understand this, could someone please help?
Click here to see answer by ankor@dixie-net.com(22740)

Question 120592: Okay the question is :
A telephone company charges $4.95 per month for long distance calls plus $.05 per minute. The monthly cost (c) of long distance calls can be described by the equation c= 0.05m + 4.95 where m is the number of minutes. Set this equation up so that it is able to be graphed.
Click here to see answer by josmiceli(19441)

Question 120560: A movie theater charges $4 for an adult ticket and 2$ for a child's ticket. one night 380 tickets were sold for a total of $1320. How many children attended the movie that night?
I am soooooo confused could someone please help me?
Click here to see answer by Fombitz(32388)

Question 120606: y=x+2
2x+y=11
Could someone please help me?
Click here to see answer by jim_thompson5910(35256)

Question 120606: y=x+2
2x+y=11
Could someone please help me?
Click here to see answer by Earlsdon(6294)

Question 120659: solve each systems of equations algebraically
28. {2x+4y=10}
{3x-4y=-15}
Click here to see answer by jim_thompson5910(35256)

Question 120662: 35. solve each systems of equations algebraically

x+8y=0
-x+y=-9
Click here to see answer by jim_thompson5910(35256)

Question 120663: solve each systems of equations algebraically

36. x+5y=11
3x+2y=46
Click here to see answer by jim_thompson5910(35256)

Question 120664: solve each systems of equations algebraically

38. -3x+12y=6
2x-8y=6
Click here to see answer by jim_thompson5910(35256)

Question 120670: solve each system of inequalities by graphing

42. {-9x+3y>-3}
{2x-y>-3}
Click here to see answer by jim_thompson5910(35256)

Question 120711: word problem: Bob climbed down a ladder from his roof, while Rob climbed up another ladder next to him. Each ladder had 30 rungs. Their friend Jill recorded the following info:
Bob went down 2 rungs every second, Rob went up 1 rung every second.
At some point they were at the same hight, what rung were they on. I know the answer is ten, but I can't come up with the 2 equations that I need to get the answer. We are working on finding points of intersection. Can you help me? Thank!
Click here to see answer by bucky(2189)

Question 120743: 2a=8
a+b=2
Click here to see answer by nabla(475)

Question 120743: 2a=8
a+b=2
Click here to see answer by rapaljer(4671)

Question 120754: Classify each system. Give the number of solutions.
{y=-x+5
{x+y=5

Click here to see answer by rapaljer(4671)

Question 120842: Five years ago, Liz was twice as old as her younger sister. Five years from now, Liz will only be 1 1/3 times as old as her sister. How old is each now?
I'm really confused could someone help me please?
Click here to see answer by stanbon(75887)

Question 120844: The sum of the two digit number is 8, and their difference is 6. If the value of the number is less than 50, what is the number?
Could someone help me please?
Click here to see answer by stanbon(75887)

Question 120846: The sum of Jim's age and Mike's age is 52. Six years ago Mike was four times as old as Jim was. How old is Jim now?
Could someone help me please?
Click here to see answer by checkley71(8403)

Question 120843:

2y-x=-8 3x+4y=-6
I have to solve this by elimination and Im really confused. Could someone help please?
Click here to see answer by checkley71(8403)

Question 121110: SUBSTITUTION AND ELIMINATION
1. 2X+Y-3Z=0
2. -2X+2Y+Z=-7
3. X-4Y-3Z=7
TRYING TO SOLVE FOR X,Y,Z
TRIED ELIMINATING X BY ADDING 1&2 WHICH GAVE ME 3Y-2Z=-7 ANS. IS NOW NEW ANS.4 THEN TRIED TO SOLVE BY ELIMINATING X AGAIN BY USING1&3 WHICH CHANGED NO.3 AFTER MULT. -2(X-4Y-3Z=7 WHICH GAVE ME -2X+4Y+6Z=-14 WHICH IN TURN GAVE ME NEW ANS.5 NOW- THIS IS WHERE I GET CONFUSED DO I SOLVE FOR EITHER Y OR Z IN NEW ANSWERS 4&5 BY FINDING NEW COMMON FACTOR, THEN SOLVING? OR DO I PLACE ANY OF THE ANSWERS INTO ANOTHER PROBLEM?
Click here to see answer by stanbon(75887)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515