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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
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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-example-1
User Sabino
by
7.7k points

2 Answers

3 votes
Oh, I love elimination <3 Would you like to eliminate x or y?
User LeeNeverGup
by
7.8k points
4 votes
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
User Vitaliy Isikov
by
8.0k points
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