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Maddiie

  • 5 years ago

Find the solution to each system by the substitution method. 2x-5y=-1 x-3y=-3

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  1. amistre64
    • 5 years ago
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    2x-5y=-1 x-3y=-3 (-2) 2x -5y =-1 -2x +6y = 6 ------------ y = 5

  2. anonymous
    • 5 years ago
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    smells like teen spirit here

  3. amistre64
    • 5 years ago
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    x = 12; y=5

  4. amistre64
    • 5 years ago
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    to sub tho is to find a 'value' from one equation and substitute it in the other to get a solid value

  5. amistre64
    • 5 years ago
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    its very labor intensive .... but works

  6. anonymous
    • 5 years ago
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    or use a matrix

  7. anonymous
    • 5 years ago
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    and matlab

  8. immanuelv
    • 5 years ago
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    cannot use matrix on this

  9. anonymous
    • 5 years ago
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    I know, in regard to it being labor intensive

  10. amistre64
    • 5 years ago
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    2x-5y=-1 x-3y=-3 <-- x = 3y-3 2x-5y=-1 2(3y-3)-5y=-1 6y -6-5y =-1 y = 5 .... lol

  11. amistre64
    • 5 years ago
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    x = 3y-3 x = 3(5)-3 x = -15+3 x = -12

  12. amistre64
    • 5 years ago
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    very much labor inducing lol

  13. anonymous
    • 5 years ago
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    haha for real

  14. anonymous
    • 5 years ago
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    ive seen enough facoring type questions.. i want to see integration

  15. maddiie
    • 5 years ago
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    This was very confusing.

  16. amistre64
    • 5 years ago
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    its like using a chain rule for solving equations....

  17. amistre64
    • 5 years ago
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    x = 'value'; use x in other equation: y = 'real value'; use in other equation x = real value

  18. maddiie
    • 5 years ago
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    Another on one. 10x+3y=-8 2x+y=2

  19. maddiie
    • 5 years ago
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    I'm going to try to do it on my end

  20. anonymous
    • 5 years ago
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    good girl

  21. anonymous
    • 5 years ago
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    a lot of ppl here don't try

  22. amistre64
    • 5 years ago
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    y = -2x+2 .... use it in other equaiton 10x +3(-2x+2) = -8 10x -6x +6 = -8 16x = -14 x = -7/8

  23. amistre64
    • 5 years ago
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    use x value in other equation to solve for y y = -2(-7/8)+2 y = 7/4 +2 y = 15/4

  24. maddiie
    • 5 years ago
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    Thanks. But you have to try because if not you aren't learning anything just getting answers.

  25. amistre64
    • 5 years ago
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    10x+3y=-8 2x+y=2 (-3) 10x+3y=-8 -6x -3y=-6 ----------- 4x = -14 x = -7/2 ..... lol

  26. anonymous
    • 5 years ago
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    actually, we will be doing the elimination

  27. amistre64
    • 5 years ago
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    i added wrong last time lol 10-6 = 16? what a farce

  28. amistre64
    • 5 years ago
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    2x -7/2 = 2 4x -7 = 4 4x = 11 x = 11/4

  29. amistre64
    • 5 years ago
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    just shoot me lol

  30. amistre64
    • 5 years ago
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    2(-7/2) +y = 2 -7 +y = 2 y = 9 .... and that my final offer lol

  31. amistre64
    • 5 years ago
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    thatll teach ya to ask 2 questions in one post ;)

  32. maddiie
    • 5 years ago
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    lol... I'm trying to figure it out and you guys keep going. AHHHHH

  33. anonymous
    • 5 years ago
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    2x-5y=-1 (x-3y=-3)*-2 ----> -2x+6y=6 then add, y=5 2x-5y=-1 2x-5(5)=-1 2x-25=-1 2x=25-1 2x=24 x=12

  34. gw2011
    • 5 years ago
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    The answer is x=12 and y=5

  35. anonymous
    • 5 years ago
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    i hope this helps.

  36. amistre64
    • 5 years ago
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    dbl check 10x+3y=-8 10(-7/2) +3(9) = -8 -35 + 27 = -8 -8 = -8 ...... thats good 2x+y=2 2(-7/2) +(9) = 2 -7 +9 = 2 2 = 2 ....... thats good x = -7/2 and y = 9

  37. amistre64
    • 5 years ago
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    yeah i had a -12 up top eh.. silly me lol

  38. anonymous
    • 5 years ago
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    is this your answers?

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