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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 368943: I can not find guidance on solving systems of linear equations with three variables. Please help!
x+y+z=13 10x+12y+7z=129
Click here to see answer by Fombitz(32388)

Question 368958: Find the consecutive even numbers whose sum is 108.

Click here to see answer by stanbon(75887)

Question 368784: the table shows the height of a plant as it grows
based on your model predict the height of the plant at 12 months
time(month) plantheight(cm)
3 9
5 15
7 21
9 27
Click here to see answer by mananth(16946)

Question 369018: 1) x+y=9 x+2y=13 x= y=
2) 3x+7y= 24 9x+5y=24 x= y=
3) 4x+y=17 2x+3y+21 x= y=
4) 18x+y=42 6x-3y=-6 x= y=
5) x+y+2z=5 x+y=5 x+3y+z=11 x= y= z=
6) x+10y+z=52 5x+y+4z=15 x+2y-3z=12 x= y= z=
7) 2x+2y+4z=10 3x+3y=15 4x+12y+4z=44 x= y= z=
Click here to see answer by Fombitz(32388)

Question 369070: I am needing help with a system of equations with 3 variables
The first equation in this problem is 6q-r+2s=8
The second equation is 2q+3r-s=-9
The third equation is 4q+2r+5s= 11
I am in Algebra 2 in high school and know how to use substitution and elimination.
Click here to see answer by Fombitz(32388)

Question 369085: Solve using substitution.
2x + y = -9 so this is what I tried... 2x - 2x -9 = -9
-2x -2x
-2x -9 = -2x -9
+9 +9
-2x = -2x???? What am I doing wrong?
y= -2x -9
Click here to see answer by Fombitz(32388)

Question 369116: How do you solve a problem like this? y= 3x and 3x+4y= 30
Click here to see answer by neatmath(302)

Question 369397: 5(3x - 2y)- 5(4x + y)
Click here to see answer by Fombitz(32388)

Question 369397: 5(3x - 2y)- 5(4x + y)
Click here to see answer by user_dude2008(1862)

Question 369486: solve the equation algebraically.
4x - 3 = 2
&
9 = 10 - x
Click here to see answer by ewatrrr(24785)

Question 369509: Solve for x, y and z
x + y + z = 2
x + 2y - z = 5
3x - y = 16
answer: (x;y;z) = ( ; ; )
Click here to see answer by Fombitz(32388)

Question 369574: the variable x and y vary directly. Use the given values to write an equation that relatesx and y.
1) x=3, y=15
2) x=4, y=-16
plz i need help asap
Click here to see answer by Alan3354(69443)

Question 369608: I am supposed to solve a linear equation using the method of elimination, I have retried doing it over and over but when I go back to check my work it doesn't come out as the correct answer. So I need help solving this by using method of elimination. Please help me solve this equation: x+3y=14
x+2y=10
Hopefully you know this method, I do but this particular problem is causing me to struggle, so can you show me the steps to how you figured it out? Thank you!
Click here to see answer by Fombitz(32388)

Question 369621: Find the y-intercept of the graph of the equation: y - 3x = 4
Find the x-intercept of the graph of the equation: x + 6y = 7

Click here to see answer by Fombitz(32388)

Question 369644: Find the y-intercept of the graph of the equation: y = 5 - 3x

Click here to see answer by rfer(16322)

Question 369642: Find the x-intercept of the graph of the equation: 4x + y = 3
Find the y-intercept of the graph of the equation: 2y + x = 8

Click here to see answer by rfer(16322)

Question 369660: Can you help me with this problem please? 2u+v=9
u/2 -1/2=-v
I have to solve it using elimination but every time I try to check my solution it comes out incorrect. Can you help me please? I would really appreciate it! Thank you!
Click here to see answer by edjones(8007)

Question 369675: how would you write this in basic form (y= mx+b)
y = 5 - 3x

Click here to see answer by Fombitz(32388)

Question 369675: how would you write this in basic form (y= mx+b)
y = 5 - 3x

Click here to see answer by Alan3354(69443)

Question 369589: Find the x-intercept of the graph of the equation: x + 6y = 7
Find the x-intercept of the graph of the equation: 4x + y = 3

Click here to see answer by Fombitz(32388)

Question 369702: I'm having trouble solving this problem
1/3x + 5 = - 4
Click here to see answer by Fombitz(32388)

Question 369702: I'm having trouble solving this problem
1/3x + 5 = - 4
Click here to see answer by rfer(16322)

Question 369702: I'm having trouble solving this problem
1/3x + 5 = - 4
Click here to see answer by checkley77(12844)

Question 369953: graph this equation -2x+4y=-8
need to see where the line goes
Click here to see answer by jim_thompson5910(35256)

Question 369977: y=x+8
x+y=2
use substitution to solve each system of equation
Click here to see answer by jim_thompson5910(35256)

Question 369875: Carla has already written 10 pages of a novel. She plans to write 15 additional pages per month until she is finished.
Write an equation to find the total number of pages P written after any number of months m.
Click here to see answer by mananth(16946)

Question 370032: Solve the question by the method of elimination by substitution :-
Question :-
3x-4y=20
x+2y=5
Click here to see answer by Fombitz(32388)

Question 369868: the total cost of gasoline varies direcly with the number of gallons purchased gas cost $1.96 per gallon write a direct variation to model the total cost c for g gallons of gas
Click here to see answer by Fombitz(32388)

Question 369871: the amount of a persons paycheck p varies with the number of hours worked t. for 16 hours worked the paycheck is $108.00 write an equation for the relationship between hours of work and pay
Click here to see answer by Fombitz(32388)

Question 370133: 4x-y=9
x-3y=16
Click here to see answer by Fombitz(32388)

Question 370279: solve by substitution:
1: x-y=-8
y=3x
2: 2x+y=1
x=8-3y
Solve:
3:x+y=20
-2x+y=5
4:3x+y=8
x-y=12
Click here to see answer by Alan3354(69443)

Question 370396: I must solve the equation using the add/subtract method
3x+9y=9
-x+5y=-3
Click here to see answer by stanbon(75887)

Question 370395: I must solve the equation using the substitution method.
2x+y=3
y=5x-11
I worked the problem, but i dont know if it is correct...i solved as follows..
2x+5x-11=3
7x-11=3
+11 +11
7x = 14
-- --
7 7
x = 2
Then I solve for y as follows:
y=5(2)-11
y=10-11
y = -1
So, my answer is (2,-1)
Is this correct??

Click here to see answer by stanbon(75887)

Question 370426: I must solve this system if possible, I worked the system and received the answer below...Im wondering if it is correct.
3x+y+z=0
2x-y+z=0
2x+y+z=0
My answer is
z=4, y=-25, x=18
Thank U in advance.
Click here to see answer by Alan3354(69443)

Question 369954: The Madison Local High School marching band sold gift wrap to earn money for a band trip to Orlando,Florida .The gift wrap in solid colors sold for $4.00 per roll ,and the print gift wrap sold for $6.00 per roll .The total number of rolls sold was 480 ,and the total amount of money collected was $2340. How many rolls of each of each kind of gift wrap were sold?
Click here to see answer by scott8148(6628)

Question 370678: 9x - (5x-5) = 37
How do I solve and what is the x

Click here to see answer by mananth(16946)

Question 370880: when multiplying the equation, to eliminate a fraction, I multiplied both sides by the denominator in the fraction. do i also need to multiply the whole number.
For example: 2/9x = 4/3x + 5
When multiplying both sides by 3, do i also need to multiply 5 by three as well?
Click here to see answer by ankor@dixie-net.com(22740)

Question 371047: y=4x+2 , y=9x-3
Click here to see answer by mananth(16946)

Question 371086: the difference between 1/2 of a number and 1/3 of a number is 9. Find the number. How do I write this?
Click here to see answer by mananth(16946)

Question 371092: the sum of three consecutive odd integers is 51. Find the three integers. How do I write this?
Click here to see answer by Fombitz(32388)

Question 371094: one number is 4 times a second number and their sum is 65. Find the numbers. How do I write this?
Click here to see answer by rfer(16322)

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