Question

Solve the following by substitution
2x - 3y = -6
-5x - 9y = 15

Answer 1

x=-3, y=0. (-3, 0).

Explanation:

2x-3y=-6

-5x-9y=15

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-3(2x-3y)=-3(-6)

-5x-9y=15

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-6x+9y=18

-5x-9y=15

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-11x=33

x=33/-11=-3

2(-3)-3y=-6

-6-3y=-6

3y=-6-(-6)

3y=-6+6

3y=0

y=0/3=0