Question

Solve the following problem using the substitution method. Please make sure to show all of your work. Please and thank you!

7x + 6y = -9
y = -2x - 1

Answer 1

x=3/5, y=-11/5. (3/5, -11/5).

Explanation:

7x+6y=-9

y=-2x-1

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7x+6(-2x-1)=-9

7x-12x-6=-9

-5x-6=-9

-5x=-9+6

-5x=-3

x=-3/-5=3/5

y=-2(3/5)-1=-6/5-1=-6/5-5/5=-11/5