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anonymous

  • one year ago

Solve the system of equations 5x-y=3 and -10x+2y=-6 Answers: A; 0.-3 B: -3.0 C: 3,12 D: no solution E: infinitely many solutions

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  1. anonymous
    • one year ago
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    isolate y in the first equation

  2. anonymous
    • one year ago
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    can you do that?

  3. anonymous
    • one year ago
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    I don't think so... Am I rewriting the first equation?

  4. anonymous
    • one year ago
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    ya you want y by itself

  5. anonymous
    • one year ago
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    first add y to both sides

  6. anonymous
    • one year ago
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    5x=3+y

  7. anonymous
    • one year ago
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    then subtract 3 from both sides

  8. anonymous
    • one year ago
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    y=5x-3

  9. anonymous
    • one year ago
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    now plug in (5x-3) for y in the second equation

  10. anonymous
    • one year ago
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    -10x+2(5x-3)=-6

  11. anonymous
    • one year ago
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    now try and solve for x

  12. anonymous
    • one year ago
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    -10x+4=-6?

  13. anonymous
    • one year ago
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    no, foil out 2(5x-3)

  14. anonymous
    • one year ago
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    Wouldn't I have to do 2 times 5 then 2 times 3

  15. anonymous
    • one year ago
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    2 times 5 plus 2 times -3

  16. anonymous
    • one year ago
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    *2 times 5x

  17. anonymous
    • one year ago
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    2 times 5x= 10x 2 times =3= -6

  18. anonymous
    • one year ago
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    thats right, so we have -10x + 10x - 6 = -6

  19. anonymous
    • one year ago
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    simplify that

  20. anonymous
    • one year ago
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    Simplify? Like break it down again

  21. anonymous
    • one year ago
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    you want to get x by itself to solve it

  22. anonymous
    • one year ago
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    Do you minus one of them on both sides

  23. anonymous
    • one year ago
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    lets just look at the x's. what is -10x + 10x?

  24. anonymous
    • one year ago
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    0..

  25. anonymous
    • one year ago
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    that's right

  26. anonymous
    • one year ago
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    Yayy

  27. anonymous
    • one year ago
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    so what should be your answer?

  28. anonymous
    • one year ago
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    0,-3?

  29. anonymous
    • one year ago
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    no, how did you get -3? anyways, since the x's cancel out there can't be a solution to this system of eqaution

  30. anonymous
    • one year ago
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    Ah okay >< sorry, thanks for your help!

  31. anonymous
    • one year ago
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    no problem

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