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

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Question 693720: David has been working for his company since 1990. Each year he gets a $2100 raise, in 1998 he earned one and a half times as much as he earned in 1990.
Write an equation in the form of y=mx+b that models David's salary y in terms of number of years x since he started working there. What was his salary in 1998? How much will he earn in 2005?
Click here to see answer by josmiceli(19441)

Question 693779: what is the answer to x-2y=9 -3x+y=-7

Click here to see answer by RedemptiveMath(80)

Question 693831: how do you write an equation for a linear function f with the given values
the problem i need help wiht is
f(-4)=5,f(2)=2
Click here to see answer by ReadingBoosters(3246)

Question 693864: y=-5x-4 y=1/2x+3
Click here to see answer by stanbon(75887)

Question 693952: My child frank pesapane goes to wiliam davies technical high school and they are not allowed to bring there books home. Frank made high honors last marking period but now is failing math .he has to match the graph with its linear system and tell how man the sulotions have for example -2 + y =1 -4x +2y=-6. Can u please help us thank sincerely Jeannette eddinger
Click here to see answer by Alan3354(69443)

Question 694132: I need to put 8x+5y=30 in to y=
please help i have a big test tomorrow a really need help so i can study from my notes. thanks
Click here to see answer by bennettc18(2)

Question 694134: What is the answer to 4x+y=-8 and 3x+3y=3 using elimination?
Click here to see answer by mananth(16946)

Question 694319: x+5y=4
x=5y-16
solve equation by the substitution method
Click here to see answer by Ave(106)

Question 694517: X=2y+1
X+3y=16
Click here to see answer by checkley79(3341)

Question 694556: I'm sorry, there was no selection for Slope.
Translate the Equation to Slope-Intercept Form:
-2x + 3y = 16
So I know that y = mx + b is the formula to find slope-intercept form and m is the slope.
But I forgot how to find slope.
Thank you very much
Click here to see answer by Ave(106)

Question 694784: 2x+y=11
Click here to see answer by Ave(106)

Question 694791: state whether the equation is linear or not 2x+y=11
Click here to see answer by unlockmath(1688)

Question 694791: state whether the equation is linear or not 2x+y=11
Click here to see answer by stanbon(75887)

Question 694858: Solve by Elimination. I was told to get rid of z first as a hint and leave as a fraction.
*w+2x+5y=11

-2w+x+4y+2z=-7
w+2x-2y+5z=3
-3w+x=-1
I started out like this: 5(-2w+x+4y+2z=-7)--->-10w+5x+20y+10z=-35
2(w+2x-2y+5z=3) ---> 2w+4x-4y+10z=6
I subtracted because "w" are postive ____________________
-12w+x+24y=-41
the rest I'm still stuck on. Please Show How to solve for x,y,z, and w

Click here to see answer by Alan3354(69443)

Question 694925: how do you solve this linear system by using substitution
x=6-4y
2x-3y=1
Click here to see answer by jim_thompson5910(35256)

Question 694927: how do you solve this linear system by using substitution?
-x+2y=6
8x+y=31

Click here to see answer by mananth(16946)

Question 694987: Solve the system of linear equations by graphing
3x-y=0
6x+y=9
what is the solution of the system of equations?
Click here to see answer by stanbon(75887)

Question 694987: Solve the system of linear equations by graphing
3x-y=0
6x+y=9
what is the solution of the system of equations?
Click here to see answer by lynnlo(4176)

Question 694961: solve by he linear combination method
2x+3y=8.1
5x-2y=-1.6
Click here to see answer by MathLover1(20850)

Question 695013: 6a=2-b use the method of substiution
6a=6-b
Click here to see answer by lynnlo(4176)

Question 695013: 6a=2-b use the method of substiution
6a=6-b
Click here to see answer by Ave(106)

Question 695050: find the slope if it exists of the line containing the pair of points
(-3,14) and (-5,-15)
Click here to see answer by Ave(106)

Question 695050: find the slope if it exists of the line containing the pair of points
(-3,14) and (-5,-15)
Click here to see answer by stanbon(75887)

Question 695037: How do you solve this equation using the elimination method?
a+7b=7
a+2b=-3
Click here to see answer by Ave(106)

Question 695244: How do you do these kind of problems 2(10+7x)=-36 and -79=-5x-4x+2
Click here to see answer by jim_thompson5910(35256)

Question 695300: Find a solution to the system of equations by graphing
x+y=-8
3x+y=-6
Click here to see answer by Ave(106)

Question 695298: Find a solution to the system of equations by graphing
5x+2y=10
5x-2y=10
Click here to see answer by Ave(106)

Question 695338: Find a solution to the system of equations by graphing.
x+y=6
x-y=0
Click here to see answer by Ave(106)

Question 695343: Find a solution to the system of equations by graphing.
2x-y=8
x+y=1
Click here to see answer by mananth(16946)

Question 695365: Solve the following systems of equation by substitution:
1. y=3x
2x+y=15
Click here to see answer by solver91311(24713)

Question 695383: Solve the following systems of equation by substitution:

4. x=2y
3x-2y=24

Click here to see answer by mananth(16946)

Question 695385: Solve the following systems of equation by substitution:

5. x-2y=11
x=1+3y

Click here to see answer by ReadingBoosters(3246)

Question 695385: Solve the following systems of equation by substitution:

5. x-2y=11
x=1+3y

Click here to see answer by MathTherapy(10552)

Question 695382: Solve the following systems of equation by substitution:

3. y=x-5
y-x=10

Click here to see answer by ReadingBoosters(3246)

Question 695649: I am stuck on this Linear Systems problem.
Roy and Steve have the same number of coins. Roy has only dimes and Steve has only quarters. If Steve has $1.80 more than Roy does, how many coins does each have?
Thanks in advance
Click here to see answer by stanbon(75887)

Question 695730: you need at least 3 hours to do your English and history homework. It is 12:00 p.m. on Sunday and your friend wants you to go to the movies at 7:00 p.m. Write inequalities that shows the number of hours you could spend doing homework for each subject if you go to the movies. graph your result.
Click here to see answer by josmiceli(19441)

Question 695848: Hello, I've been having trouble with Linear equations. Can you help me how to solve them step by step? Thanks
y y>-x^2+1

p.s: I need to Graph it too.
Click here to see answer by KMST(5328)

Question 695964: I have to put this in standard form....
3a+b-2=b

Thank you!
Click here to see answer by jim_thompson5910(35256)

Question 695813: The sums of the digits of a two digit number is 14. If 4 is added to the number, the result is seven times the units digit. find the number?

I have tried solving this problem like 15 times and i still have't come up with the correct answer please help me understand how to do this problem and how to write the equation
Click here to see answer by ankor@dixie-net.com(22740)

Question 696231: do u have any practice worksheets i can do I'm taking it a year early and my teacher has been absent the past week but we still have a test tomorrow

Click here to see answer by solver91311(24713)

Question 696224: Christinia's cell phone plan is $29.95 per month plus $0.10 for every minute over 500 minutes. If her cell phone bill was $99.95 this past month, how many minutes did she spend on the phone?
Click here to see answer by checkley79(3341)

Question 696260: Find the equation of parabola with a vertex at (2,-12) that passes through the point (0,0).
Can you please help me out? Thanks in advance.
Click here to see answer by solver91311(24713)

Question 696675: I don't understand Linear Equations. My teacher does the notes too fast in class and I can't keep up with the lesson and then I don't understand it. What I do not understand is how you get the linear equation for two given points. How do you get the linear equation for "Write a linear equation for the line going through the points (-3, 105) and (6, -3"?

Click here to see answer by jim_thompson5910(35256)

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