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Solve this system by substitution (Pls answer step by step so I can understand thank you!)

Solve this system by substitution (Pls answer step by step so I can understand thank-example-1
User Carmela
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1 Answer

4 votes

Answer:

-3

Explanation:

1) -x-y = 9

2) -3x+y = 3

By adding 3x to each side on equation #2, you get that y = 3+3x.

Now, we can substitute the value of y into the second equation. If you do this, you will get that
-x-(3+3x)=9.

Simplifying gives you:
-4x-3=9

Adding three to both sides:
-4x=12

And finally dividing by negative four:
x=-3

You will get x = -3

User Mariangeli
by
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