SOLUTION: I really need some help on substitution methods I have tried all the problems. I understood a the beginning, but then it got harder. The problem is y/2-x=1 and x+y+7=0.

Question 77823This question is from textbook Algebra
: I really need some help on substitution methods I have tried all the problems. I understood a the beginning, but then it got harder. The problem is y/2-x=1 and x+y+7=0. This question is from textbook Algebra

Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Solve by substitution:
Solve this one for x: and substitute for x in the second equation.

Simplify by multiplying by 2 to clear the fraction.
Combine like-terms.
Subtract 12 from both sides.
Finally, divide both sides by 3.

Now substitute this value of y into the highlighted equation above to find x.

The solution is: (-3, -4)
Here's the graphic solution:

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