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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 23624:
Click here to see answer by kviji_85(2)

Question 23624:
Click here to see answer by Earlsdon(6287)

Question 23704: How can i figure these linear equations out they are so confusing. For example, trying to find three ordered pairs, why three??
ex: y = 7- 4x
PLEASE HELP ME ASAP THANKS : )
Click here to see answer by rapaljer(4667)

Question 23679: write an equation of the line that passes through each point with the given slope.
(-3,-5),m=-5/3(5 over 3)
Click here to see answer by venugopalramana(3286)

Question 23661: what is the answer for these problems. Iam having diffcult with just these, please show work and use sub. or eilm. thanks.
1. x-9y=237
5x+3y=-267

2. x-4y=119
16y--432

3. 4x+5y=1
14x+5y=191

4. 8x+y=74
3x+19y=363

5.9x+17y=-475
7x+11y=-285

6. 9x+13y=536
9x+16y=587

7. 10x-y+-145
13x+3y=-339

8. 17x-8y+=154
17x-12y+=150

9. 11x-4y=364
2x-19y=322

10. x+2y=47
x-3y=7

11. 3x-4y=-198
x-3y=-111

12. 12x+13y=491
12x+19y=629

Click here to see answer by elima(1433)

Question 23716: Please solve by addition method:
3x - 4y = 9
-3x + 4y = 12
Click here to see answer by rapaljer(4667)

Question 23719: Please solve by addition method:
-3x + 2y = 8
3x + 2y = 8
Click here to see answer by Paul(988)

Question 23718: Please solve by addition method:
x - y = 3
-6x + 6y = 17
Click here to see answer by rapaljer(4667)

Question 23717: Please solve by addition method:
x - y = 3
-6x + 6y = 17
Click here to see answer by rapaljer(4667)

Question 23653: I am trying to solve a system by substitution. Can you please show me how to solve this?
27y = 3x + 3
5y - 4x = 8
Thank you,
Brandon
Click here to see answer by rapaljer(4667)

Question 23834: g-27=148

Click here to see answer by Alg.(2)

Question 23835: 24=h-53
Click here to see answer by Alg.(2)

Question 23785: I would like you opinion on which method would you prefer to use when solving systems of equations, elimination or substitution?
Click here to see answer by elima(1433)

Question 23832: a-4=-10
Click here to see answer by elima(1433)

Question 23833: m+54=36
Click here to see answer by elima(1433)

Question 24039: -y=-x+1
Click here to see answer by rapaljer(4667)

Question 23995: can u help me with this equation: -3(h-6)=5(2h+3)
Click here to see answer by yhtong(11)

Question 24007: 5x+6y=12 How do I solve this system of linear equation?
3x-2y=-4
Click here to see answer by venugopalramana(3286)

Question 23961: 2x-1=y
Click here to see answer by rapaljer(4667)

Question 24092: a boy has $350.00 in nickel and dimes in his pocket. if there are 45 coins, how many kind were there.
Click here to see answer by rapaljer(4667)

Question 24092: a boy has $350.00 in nickel and dimes in his pocket. if there are 45 coins, how many kind were there.
Click here to see answer by Paul(988)

Question 24091: (2a^3)^2+b+3b^2-a^6+4b-(b-b)+(2a-a^3)
Click here to see answer by rapaljer(4667)

Question 24090: (2a^3)^2+b+3b^2-a^6+4b-(b-b)+(2a-a^3
Click here to see answer by rapaljer(4667)

Question 24112: Please help me solve this equation: A=P(1+rt) solve for r
Please help me solve this equation: PV=nRT solve for T
Click here to see answer by rapaljer(4667)

Question 24112: Please help me solve this equation: A=P(1+rt) solve for r
Please help me solve this equation: PV=nRT solve for T
Click here to see answer by Earlsdon(6287)

Question 24151: ab=2/9ba, where a + b = 9
Click here to see answer by AnlytcPhil(1277)

Question 24225: The combined age of two people is 91. Person A is twice as old as person
B was when Person A was as old as Person B is now. How old is each person?

Click here to see answer by AnlytcPhil(1277)

Question 24233: 2x+3y=21
-3x-6y=-24
Click here to see answer by AnlytcPhil(1277)

Question 24393: 9+11C<2(0.5C-5)
Click here to see answer by AnlytcPhil(1277)

Question 24494: 5x-3y=-11
x-2y=2
Click here to see answer by elima(1433)

Question 24526: I am having trouble with this problem.
SOLVE THIS SYSTEM OF EQUATIONS, WHEN POSSIBLE...
x+y+z=4
x-y+2z=8
2x+y-z=3
I used the elimination method and broke this down into two equations with only two variables. I try to eliminate another variable, but cannot do it! HELP PLEASE!!
Click here to see answer by Earlsdon(6287)

Question 24552: Solve for x in the expression: - ( 1/x ) – 5 = 0; Show your recheck.
I'm not sure what to do with the -(1/x)?
Click here to see answer by Earlsdon(6287)

Question 24598: Would someone please tell me if this is correct?! Thank You!
9x^2-4y^2
Is this Prime Factorized???
Click here to see answer by Earlsdon(6287)

Question 24635: how do i do this problem?
Solve by graphing
{x+7=y
{-4+2=y
Click here to see answer by rapaljer(4667)

Question 24596: Here is the problem:
Factor polynomial completely.
250-16x^3
Thanks!
Click here to see answer by rapaljer(4667)

Question 24670: I have worked this problem about 5 times and the answers I get do not satisfy each equation. Could someone please tell me if this equation is inconsistent??
Solve this system of equations, when possible:
x-y+z=7
2x+5y-4z=2
-x+y-z=4
these are the answers I got, but do not satify each equation!
x=-4, y=-6, z=10
x=10, y=6, z=-3
I then multiplied 1)by -2 and 3)by 2 and added them seperatley to 2) and got answers of: 7y-6z=10 and 7y-6z=-12
I then subtracted them and got: 0=-2
which is and inconsistent system, right??!!
Thanks!
Click here to see answer by stanbon(57387)

Question 24713: I need help with a linear equation with variables on both sides.
Example:2p-9=5p+12
How would I do this?
Thank You,
Chris
Click here to see answer by algebrapro18(206)

Question 24726: solve algebraically for the value of x where these two lines cross:3y=21-6x and 3y=24-9x (show work)
Click here to see answer by rapaljer(4667)

Question 24802: 9-2m/7=19
Click here to see answer by chripchrip(6)

Question 24728: -6x+8y=-16
-2x-3y=-28
A system~I know that the answer is (8,4) but how do you get that?
Click here to see answer by elima(1433)

Question 24855: how can i solve this problem????
the length of a rectangle is 2 cm more than four times the width if the perimeter of the rectangle is 24 cm what are its dimensions?
Click here to see answer by rapaljer(4667)

Question 24861: i nead healp in this 2?????????
a rental car charges 15 $ per day plus 13 cents per mile to rent a certain car. another agency charges 19$ per day plus 19 cents per mile to rent the same car. how many miles will have to be drive for the cost of a car from the firs agency to equal the cost of a car from the second agency?( raound your answer to the nearlest hundrdth of a mile.) express the problems as a system of a linear equotion and solve using the method of your choice.
Click here to see answer by venugopalramana(3286)

Question 24930: the question is .. the book says write the equation in slope intercept form and standard form .. and the equation is y - 50 = 8 (x - 4 ) not for standard form i got 8x - y = - 18 .. but for slope intercept i dont understand how you do it .. i looked in to book for te answer and it was y = 8x + 18 .. i keep foing over it but i dont understand how they got that solution
Click here to see answer by smartypants(7)

Question 24974: We are learning standard forms of linear equations. Here are 2 problems i did and the teacher marked wrong,why?
Ax+By=C
1. rewrite this y=2x-7 in standard form: my work: y=2x-7
-2x -2x (minus 2x on both side)
____________
-2x+y=-7 is my ans.

2. rewrite this y= 3/4x-5 in standard form:
my work: y=3/4x-5
4y=4(3/4x-5) multiply by 4 on
both side and use
distributive property
_____________
4y=3x-20
-3x -3x minus 3x on both side
_______________
-3x + 4y= -20 is my ans.
What am i doing wrong?

Click here to see answer by stanbon(57387)

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