Tracey M. answered • 06/27/18

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This prolblem is quickly solved with the elimination (also called addition/subtraction) method

Multiply the second eqution by 4

-12x - 4y = 16

Now add that to the first equation

-9x + 4y = 8

-12x - 4 y =16

This sum is -21x = 24

Divide both sides by -21 and you get x= -24/21 which reduces to -8/7

Answer C