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

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Question 593819: 2x-3y=-2
4x+y=24
This is elimination method im practicing for exam .When do we add and subtract when dealing with the elimnation method?They say when its the same you subtract and when it is different you add can someone give me and example of what this means i dont understand..
Click here to see answer by scott8148(6628)

Question 593837: y=x+3
Y=X^2
sOLVE FOR ME PLEASE
Click here to see answer by Alan3354(69443)

Question 593843: Solve the following inequality. Then place the correct number in the box provided.
2x + 1 < 5
Click here to see answer by rfer(16322)

Question 594108: x-4/8 - x+6/16=2
I got x=15 as my answer is it correct
Click here to see answer by jim_thompson5910(35256)

Question 594111: How do you solve for x and y in this problem. 5x + 2y = 63 and 3x + 2y = 51
Click here to see answer by Alan3354(69443)

Question 594122: 2x-1/18=1-6
My LCD is 18
i got a fraction
(18)2x-1/(18)=1/6
2x-1=3
2x=3+2
2x=5
x=5/2
Click here to see answer by jim_thompson5910(35256)

Question 594235: Solve this system of equations using substitution. Put your answer in ordered pair for, (x, y). x + 2y = 7 2x + y = 8
Click here to see answer by mananth(16946)

Question 594354: how do I solve than graph?Is there a graph calculator I can plug into?
y=1/2x+5
y=6x-6
Click here to see answer by Alan3354(69443)

Question 594622: Solve by substitution method.. Can you help me please?
2x+7y=6
x=10-7y
Click here to see answer by rfer(16322)

Question 594723: Substitute the known information from the problem into the perimeter formula . Simplify where necessary. Then, solve the equation for the unknown variable. Be sure to show all the steps.
Click here to see answer by richwmiller(17219)

Question 594863: Find the solution of the given system by the method of addition that was used in Examples 4 and 5. If there is no solution or infinitely many solutions, state so. Put the value for x in the blank.
2x - 3y = 1; x + 2y = 4
Click here to see answer by Alan3354(69443)

Question 595229: x+2y=9 -x-3y=-12
Click here to see answer by jim_thompson5910(35256)

Question 595372: when three numbers are added in pairs,the sums of the pairs are,22,39,and 45. What are the three numbers?
Click here to see answer by ankor@dixie-net.com(22740)

Question 595397: Did i write this quadratic correctly ?Here is the question----->5+2x^2=8x
2x^2-8x+5
Click here to see answer by jim_thompson5910(35256)

Question 595421: Factoring Quadratic formulas- Is this correct thus far?
5+2x^2=8x
2x^2-8x+5=0
a=2 b=-8 c=5
ac=2(5)=10 b=-8
Then i should find factors that multiply to give 10 & add to give -8 right ?
i only came up with the factors -5x(times)-2
Click here to see answer by Alan3354(69443)

Question 595463: 9x+8y=-37
x=-2-3y
solve by substitution method
Click here to see answer by shellyhotgirl(2)

Question 595487: How do I figure out this problem?
x-5y=2
2x-9y=5
Click here to see answer by rfer(16322)

Question 595485: Solve this system of linear equations:

Click here to see answer by math-vortex(648)

Question 595695: Solve the equations by substitution. If the equations are inconsistent and the solution is an empty set, write "no solution".
3x - y = 2
y = x - 1
Click here to see answer by jsmallt9(3758)

Question 595710: Solve the equations by substitution. If the equations are inconsistent and the solution is an empty set, write "no solution".
10x - 10y = 1
x = y - 3
Click here to see answer by Alan3354(69443)

Question 595754: How do I solve and check the following solving by substitution.
7x + 5y = -24
x = 28 - 7y
Click here to see answer by Alan3354(69443)

Question 595799: Write an equation that would be solved by using multiplication. Then, show how to solve the equation.
Click here to see answer by stanbon(75887)

Question 595799: Write an equation that would be solved by using multiplication. Then, show how to solve the equation.
Click here to see answer by jerryguo41(197)

Question 595890: Solve simultaneously I dont understand..\
y=x^2-4x-2
y=x-2
Click here to see answer by jim_thompson5910(35256)

Question 596010: I Factored these questions and here are my answers
1)15^3-60x
15x(x^2-4)
2)5x^3-2x^2+5x-2
x^2(5x-2) (5x-2)
(x^2+1)(5x-2)
3)3x^2+x-2
ac=3(-2)=-6 b=1
3x^2+3x-2x-2
3x(x+1)-2(x+1)
(3x-2)(x+1)

Simplify a)(x+y)(x^2-5y^4)
answer:(x^3-xy^4)+(x^2 -5y^5)

4)write the set {...,-3,-1,1,3,5,7,...}using set builder notation.
Click here to see answer by jim_thompson5910(35256)

Question 596016: Solve the following equations...this is what i did
1) 4x/x+2 + 3/x-2=4
when i set it up this is what i got
4x(x-2)+3(x+2)=4(x+2)(x-2)
2.)10b-50/b^2-b-20 divided by 15/6b+24
answer: i factored everything and flipped it over since it says to divide and i got
10(b-5)/(b+4)(b-5) X 6(b+4)/15
10(b-5)/15(b-5) where should the 6 go?
Click here to see answer by jim_thompson5910(35256)

Question 596026: Questions & answers
Transpose the formula to find s---->Question : a=2(ut-s)/t^2
I got s=l^2(2(ut-s)

Word__Problem
a)When five is taken from six times a certain number the result is fifteen.What is the number?
I GOT
LET X BE THE CERTAIN NUMBER
6X-5=15
6X=15+5
6X=20
X=20/6

b)Sidney paid a grocery bill of $3.90 with dimes and quarters.If there were 4 more dimes than quarters,how many coins of each kind did he have? Not sure how to attempt this?
Click here to see answer by jim_thompson5910(35256)

Question 595982: I thought I had the answer but I'm stuck. Can you solve this?
A rectangular lot whose perimeter is 320 ft is fenced along three sides. An expensive fencing along the lot's length costs $20 per foot and an inexpensive fencing along the two side widths costs only $8 per foot. The total cost of the fencing along the three sides comes to $2140. What are the lot's dimensions?
Click here to see answer by scott8148(6628)

Question 596059: How can this concept be extended to systems involving three variables and three equations as well as solving the following system of three equations and describing the methods you are using:

X + Y + Z = 6
2X � Y + 3Z = 8
3X � 2Y � Z = -17
Click here to see answer by Alan3354(69443)

Question 596082: Solve by elimination method:
3x-2y=20
and
2x+3y=-4
Click here to see answer by stanbon(75887)

Question 596080: x+y=9 and y=2x
Click here to see answer by math-vortex(648)

Question 596180: I need help solving for t please. A=7P+2Prt
Step by step would be appreciated!
thanks so much.
Click here to see answer by jim_thompson5910(35256)

Question 596177: After you move into your new unfurnished apartment, you call a furniture rental company. They have a sofa and a love seat combination. They will rent them to you for an initial fee of $79.80 and a monthly rental payment of $64.80. If you choose a �rent-to-own plan� you can keep the furniture after the 24th payment.
a) Write a formula that allows you to compute the total cost (Y) to you for the furniture rental after any number of payments �x�.
b) Identify the variable, coefficient, and constant for your linear equation.

Click here to see answer by richwmiller(17219)

Question 596188: what is the solution set of the equation |3-2x|=5?
(1){-1,4} (2){1,-4} (3){-1} (4){4}
Click here to see answer by jim_thompson5910(35256)

Question 596554: Solve Linear Equation of f(x) = g(x)
Given:
f(x) = 2x + 5
g(x) = 5x/2

Click here to see answer by rapaljer(4671)

Question 596541: Using the Gauss-Jordan elimination method, solve the following linear system.
2x-3y-z=0
3x+2y+2z=2
x+5y+3z=2

Click here to see answer by AnlytcPhil(1806)

Question 596547: Solve System of Equation: Solve for x and y.
-2x + 3y = 6
x + 2y = -4

Click here to see answer by Alan3354(69443)

Question 596649: Solve Linear Equation of f(x) = g(x)
What is the value of x?
Given:
f(x) = -2x
g(x) = 5x - 4

Click here to see answer by racoon(5)

Question 596673: A rectangular lot whose perimeter is 320 ft is fenced along three sides. An expensive fencing along the lot's length costs $20 per foot and an inexpensive fencing along the two side widths costs only $8 per foot. The total cost of the fencing along the three sides comes to $5800. What are the lot's dimensions?
Click here to see answer by scott8148(6628)

Question 596862: use the method of substitution to solve the system of linear equations.
3x-y=4
7x-2y=12
Click here to see answer by Alan3354(69443)

Question 596843: y= x - 6
y= 2x - 8
y= x - 4
y= -2x + 5
y= 2x+8
y=8
x=y= -3
x - y = -1
4x+y= 3.4
x= 4y
1/2x = y-1
1/3x = y
4x=y=3.4
x= 4y
x= -1/4y + 5
3x + 2y = 0
3x = -y+10
2x + 3y = -12

Click here to see answer by Alan3354(69443)

Question 596864: use the elmination method to solve the system of equations.
a+8b=12
a+3b=2
is there a solution? if so, what is the ordered pair (?,?)
Click here to see answer by Alan3354(69443)

Question 597018: solve 2x+3y+12z=900
Click here to see answer by josmiceli(19441)

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