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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 278965: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
1/5x - 1/4y = 3
2/5x + 1/2y = 2
I tried this problem on my own and was thinking that I would have to multiply the equations for example:
1/5x - 1/4y * 2/5x = 3 * 2/5x
Click here to see answer by Edwin McCravy(20055)

Question 278978: When you solve a system of linear equations, and you get your x or y how do I know which of the two equations to plug my answer into ?
Click here to see answer by Edwin McCravy(20055)

Question 279086: Solve each system.
Number One:
y = 2x + 8
y = 3x - 1

Number Two:
2x - y = 2
2x - 2y = 4

Number Three:
-x + y = 2
2x + y = -1
Click here to see answer by stanbon(75887)

Question 279132: Please help solve these 3 system equations for X and Y and Z
Equation1. X+Y+2Z=5
Equation2. X+Y=5
Equation3. X+3Y+Z=11
Equation1. 2X+2Y+4Z=10
Equation2. 3X+3Y=15
Equation3. 4X+12Y+4Z=44
What is the difference between these systems of equations?
Click here to see answer by J2R2R(94)

Question 279066: please help me with the following linear equation with decimals:
x-0.08x=460
and 2x/2 = x
Click here to see answer by mananth(16946)

Question 279354: jack and betty have 28 coins that are nickels and dimes if the value of the coins is $1.95 how many coins of each type do they have

Click here to see answer by josmiceli(19441)

Question 279354: jack and betty have 28 coins that are nickels and dimes if the value of the coins is $1.95 how many coins of each type do they have

Click here to see answer by JBarnum(2146)

Question 279393: What is the slope of the line 4x+2y=10?

Click here to see answer by richwmiller(17219)

Question 279605: My homework is to graph systems of inequalities. The problem I'm having trouble with is:
x-3y>(or equal to)-7
5x+y<(or equal to)13
x+6y>(or equal to)-9
3x-2y>(or equal to)-7
I have successfully graphed the first two, but I cannot figure out the third or last one yet. I graphed what I thought the third one looked like, but it didn't make any sense to the problem. I set the y-intercept at -1 1/3 with a slope of -9/6 which reduces to -3/2.
Click here to see answer by Theo(13342)

Question 279699: How do you solve systems by graphing... for example (2x+2y=5 & y=x-4)What would the steps be to solving this (or any) problem.
Click here to see answer by Alan3354(69443)

Question 279819: how do u solve the following problem:
y=3x
x+y=4
Click here to see answer by JBarnum(2146)

Question 279894: Number One:
5x + 4y - z = 1
2x - 2y + z = 1
-x - y + z = 2

Number Two:
x + y + z = 0
2x + 3y +2z = -1
x - y + z = 2

Number Three:
x + 2y = 0
4x - z = 4
5y + z = -1
Click here to see answer by Edwin McCravy(20055)

Question 279134: Please solve these three system equation for X and Y and Z.
Equation1. X+10Y+Z=52
Equation2. 5X+Y+4Z=15
Equation3. X+2Y-3Z=12
Click here to see answer by JBarnum(2146)

Question 280013: How do I solve the system using the substitution method and show work?
2x+3y=2
x+3y=10
Click here to see answer by nabla(475)

Question 280013: How do I solve the system using the substitution method and show work?
2x+3y=2
x+3y=10
Click here to see answer by jsmallt9(3758)

Question 280016: THE DISTANCE BETWEEN THE PLANE x + 2y - 2z = 3 and 2x + 4y - 4z = 7
Click here to see answer by nabla(475)

Question 276320: how do i do -2x+4y=0
-8x+y=15
Click here to see answer by nabla(475)

Question 280099: train A is traveling at 60 mph and train B at 80 mph. train A passes the station at 810 and train B at 825 at what time will train B catch train A?
Click here to see answer by josmiceli(19441)

Question 280111: x+9y =2 (1)
x= 8-9y (2)
Click here to see answer by richwmiller(17219)

Question 280129: Solve this system: y=5x-1 and y=8x+4
Click here to see answer by richwmiller(17219)

Question 280114: in 1992 life expectancy was 63.4. in 1998 it was 67.0
E= life expectanc in year t and let t = # of years since 1992
what is the linear function for this?
what would the life expectancy be if E(16)
Click here to see answer by richwmiller(17219)

Question 280032: solve the linear system
-7x-8y=9
-4x+9y=-22

Click here to see answer by checkley77(12844)

Question 280178: 6x+2y=16
-2x+y=-2
Click here to see answer by richwmiller(17219)

Question 280178: 6x+2y=16
-2x+y=-2
Click here to see answer by JBarnum(2146)

Question 280166: Metro Concerts can rent a truck for either $55 with unlimited mileage or $29 plus 40 cents per mile. For what mileages would the unlimited mileage plan save money?
Write an inequality to describe the situation.
Solve the inequality.

Click here to see answer by richwmiller(17219)

Question 280140: slove the follwing system of equation using subatitution 3x+6y=48 and-5x+6y=32
Click here to see answer by checkley77(12844)

Question 280247: 4y-2=33-3y
Click here to see answer by rfer(16322)

Question 280413: I need help in solving this equation - I came up with x=7 and got it wrong.
3[x-2] +2=17
Thanks
Click here to see answer by dabanfield(803)

Question 280413: I need help in solving this equation - I came up with x=7 and got it wrong.
3[x-2] +2=17
Thanks
Click here to see answer by richwmiller(17219)

Question 280414: I need help in solving the following equation. Thanks so much.
7[4x+2] + 6=4
Click here to see answer by checkley77(12844)

Question 280624: find the slope and the y-intercept
f(x)=-9x-10
Click here to see answer by richwmiller(17219)

Question 280624: find the slope and the y-intercept
f(x)=-9x-10
Click here to see answer by oberobic(2304)

Question 280641: translate to an algebraic expression
the product of 25% and some number
Click here to see answer by rfer(16322)

Question 280839: translate to algebracia expression: the product of 37% and some number?
Click here to see answer by oberobic(2304)

Question 281104: I am so confused..
d=rt
Two boats are driven in opposite directions, one at 6 miles per hour and the other at 5 miles per hour. In how many hours will they be 55 miles apart?
Click here to see answer by Fombitz(32388)

Question 281070: Solve and check the linear equation 2x-2=18

(4x -2)+7= -3(x+3)
Click here to see answer by checkley77(12844)

Question 281271: Using the addition (elimination) method to solve systems of equations .
6x-4y=11
2x+3y=-4
Click here to see answer by vleith(2983)

Question 281354: Please help with this problem
Im trying to find x, and y in the equations x=-4y and 3x+2y=20 using the substitution method
Click here to see answer by richwmiller(17219)

Question 281270: Solving using substitution .
y= -x/2+2
Y= 3x/6+7
Click here to see answer by Inkyvoyd(17)

Question 281490: Solve by elimination
How do I solve 4x-3y=39
-3x-4y=23
I have worked this problem over and over please solve this for me.
Click here to see answer by CharlesG2(834)

Question 281605: Point of intersection of the lines whose equations are y=-1/2x+3 and y=2x+8
Click here to see answer by josmiceli(19441)

Question 281605: Point of intersection of the lines whose equations are y=-1/2x+3 and y=2x+8
Click here to see answer by richwmiller(17219)

Question 281653: 1.) y=2x-1
x+3y=11 (The substitution method)
Click here to see answer by jim_thompson5910(35256)

Question 281713: 4/7=8/x
Click here to see answer by stanbon(75887)

Question 282002: Graph this equation.
y=-2x+4

Click here to see answer by brucewill(101)

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