Mathematics

Question

ELIMINATION!! How do you work out 4x+7y= -80 and 3x+5y= -58
ELIMINATION!! How do you work out 4x+7y= -80 and 3x+5y= -58

2 Answer

  • Oh, I love elimination <3 Would you like to eliminate x or y?
  • 3(4x+7y=-80)
    -4(3x+5y=-58)

    12x+21y=-240
    -12x-20y=232
    the x's cancel out and you're left with
    y=8
    then you plug in y and get
    4x+7(8)=-80
    4x+28=-80
    4x=-108
    x=27
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