SOLUTION: Solve each system by substitution {y=x-1} {x+y= -7}

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Question 328871: Solve each system by substitution
{y=x-1}
{x+y= -7}
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.y=x-1
2.x%2By=+-7
Substitue eq. 1 directly into eq. 2,
x%2Bx-1=-7
2x=-6
x=-3
Then from eq. 1,
y=-3-1
y=-4