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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 223232: 9x-5(3x-12)=30
Click here to see answer by drj(1380)

Question 223162: x + y + z =8
x – y – z = -4
-x + y – z = -8

Click here to see answer by drj(1380)

Question 223286: Use elimination to solve the system of equations.
-2x+y+3z=20
-3x+2y+z=21
3x-2y+3z=-9
Click here to see answer by checkley77(12569)

Question 223437: Solve the equation.Be sure to check your proposed solution by substituting it for the variable in the original equation. 7y-5=11y=+15
Click here to see answer by rfer(12647)

Question 223775: Please help me with the following question:
A Straight line has the equation and it meets the axes at A and B. Find the distance of the mid-point of AB from the origin, Giving your answer in the form
Click here to see answer by Alan3354(30983)

Question 223793: please help me simplify: -1[60-(78-58)]
Click here to see answer by Alan3354(30983)

Question 223825: use the distributive property to help solve the equation: 5(w-2)=-10
Click here to see answer by rfer(12647)

Question 223858: solve using elimination method
3r-2s=-15
2r+3s=29
Click here to see answer by drj(1380)

Question 223818: solve 8x-(2x+6)12
the solution is x=?
Click here to see answer by checkley77(12569)

Question 223816: determine whether (7,9) is a solution of
8x-9y=8

Click here to see answer by checkley77(12569)

Question 223790: solve using multiplication principle -1/2x=-7/8
Click here to see answer by checkley77(12569)

Question 223889: 8y-11<7y-10= the solution is y>4. Am I close
Click here to see answer by Alan3354(30983)

Question 223900: find the slope if it exist of the line containing the pair of points (-12,-1) and ( -15, -6) The slope of m=, I came up with m=3 am I close
Click here to see answer by Alan3354(30983)

Question 223896: Graph the equation and identify the y intercept y= 4/3 x+2= I think the y intercept is 1 am I close
Click here to see answer by Alan3354(30983)

Question 223968: My son's homework question is:
Find the value(s) of a for which the equation is an identity.
a(2x+3) = 9x + 12 - x
What exactly are they asking him to do here? I don't understand what they are looking for. Should he solve for a, or for x in terms of a?
thanks,
Andrea
Click here to see answer by nerdybill(6951)

Question 224157: solve by using elimination and substitution method:
3x+4y=6 and 2x+3y=5
Click here to see answer by checkley77(12569)

Question 224262: using substitution or elimination, find x and y
3x+y=1
y=x+9
Click here to see answer by drj(1380)

Question 224194: please help me solve for the indicated letter
c=2d, for d
the solution is d=?
Click here to see answer by rfer(12647)

Question 224324: Solve the following system of equations by any method you wish
X + 2y = 2
2x + 4y = 4

Click here to see answer by rapaljer(4667)

Question 224340: Graph the linear system and tell how many solutions it has. If there is exactly one solution, give the solution
4X-5Y=2
8X+Y=4
Click here to see answer by drj(1380)

Question 224344: Graph the linear system and tell how many solutions it has. If there is exactly one solution, give the solution.
-3X+4Y=-16
-6X=-8Y-32
Click here to see answer by drj(1380)

Question 224423: I have to explain how you know when an equation has Infinitely many solutions?.As well as how you know when they do not have any.
I think it is because in order for an equation to have infinitely many solutions you must have many variables, and if they do not have multiple variables then they would only have one solutions. am I correct in that thinking or am I missing something?

Click here to see answer by rapaljer(4667)

Question 224439: Suppose you need to solve a system of equations in which one equation represents a circle and the other represents a line. How many solutions can your system have?
How many solutions does the following system of equations have?
X^2+y^2=64
x=1
Click here to see answer by Alan3354(30983)

Question 224322: Solve the following system of equations by any method you wish
X + y = 5
X + 2z = 6
Y + 3z = 4

Click here to see answer by ankor@dixie-net.com(15638)

Question 224489: find three consecutive even integers such that twice largest integer exceeds the sum of the sum of the first two by 6.
Click here to see answer by drj(1380)

Question 224608: can some one please solve the problem 5(3x-2)-9(2+4x)-7=0 with workings
Click here to see answer by drj(1380)

Question 224733: how do i Find the midpoint of the line segment from ( -1/4 , 1/2 ) to ( -4 , -3 )?
Click here to see answer by Alan3354(30983)

Question 224733: how do i Find the midpoint of the line segment from ( -1/4 , 1/2 ) to ( -4 , -3 )?
Click here to see answer by drj(1380)

Question 225044: I am trying to help my daughter with her homework and need to know how to solve this equation.... 2k + 6 - K = 17
Click here to see answer by Alan3354(30983)

Question 225044: I am trying to help my daughter with her homework and need to know how to solve this equation.... 2k + 6 - K = 17
Click here to see answer by drj(1380)

Question 224321: Solve the following system of equations by any method you wish
X + 2y = 2
2x + 4y = 4

Click here to see answer by Alan3354(30983)

Question 225174: There are 385 surfers in the Surf City. Two-thirds of the boys are surfers and one-twelfth of the girls are surfers. If there are 2 girls for every boy, then how many boys and how many girls are there in Surf City?
Click here to see answer by jim_thompson5910(28504)

Question 225185: how do i solve these two problams using the elimination method ?
1. 10x+6y =0
-7x+2y =31
for this one i got (9.3, -15.5) but i have a feeling that is wrong
and 2. 3x+4y=-13
5x+6y=-19
for this one i got (-25, 15.5) but again , because the answers i gto are so big and decimals, i think im doing the problems wrong

Click here to see answer by jim_thompson5910(28504)

Question 225331: graph the equation Y=-2x+2
Click here to see answer by LtAurora(115)

Question 225406: How do i plot the following 5 equations?
1.) y= x+2
2.) y=2x-2
3.) y=2x+4
4.) y=1/6+6
5.) y=1/2Xsq-8

Click here to see answer by Alan3354(30983)

Question 225635: I need help on this problem 6v-9/3=v.
Click here to see answer by checkley77(12569)

Question 225656: Systems of Equations
A chemist has two solutions of hydrochloric acid in stock: a 50% solution and an 80% solution. How many of each should she mix to obtain 100 milliliters of a 68% solution?
Click here to see answer by checkley77(12569)

Question 225653: v = r + at
Solve For A
Click here to see answer by checkley77(12569)

Question 225675: v = r + at
Solve For A
Click here to see answer by checkley77(12569)

Question 225957: Solve by method of elimination: 2x +3y =10
-3x+y =18
Click here to see answer by drj(1380)

Question 225910: -3=-4y+1
Click here to see answer by drj(1380)

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