SOLUTION: Solve the system by substitution.Please 3x – y = –7 x + y = –9

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Question 46721This question is from textbook
: Solve the system by substitution.Please
3x – y = –7
x + y = –9
 This question is from textbook

Answer by adamchapman(301) About Me  (Show Source):
You can put this solution on YOUR website!
3x – y = –7
------> y=3x-7
x + y = –9
substitute y=3x-7 into the expression above:
x+3x-7=-9
4x=16
x=4
subsitute x=4 into y=3x-7:
y=12-7
y=5

I hope this helps,
Adam
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