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solving systems of equations by substitution how do you do it

Algebra
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3x + 2y = -15  2x =  -18

Jan 29th, 2015

3x + 2y = -15    

2x = -18

x = -18/2 = -9

subtitute ( x = 9 ) into 3x + 2y = -15

3x + 2y = -15

(3*9) + 2y = -15

27 + 2y = -15

2y = -15 - 27

2y = - 42

y = -21


The answer is x = 9 , y = -21

Jan 29th, 2015

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