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solving systems of equations subtraction

6x-y=-4
2x+2y=15
3 years ago

Answers

mathhelper
double the first:
12x - 2y = -8
2x+ 2y = 15
add them:
14x = 7
x = 1/2

sub into 6x - y = -4
3 - y = -4
-y = -7
y = 7
3 years ago

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