Question

Solve by using substitution

Answer 1

x = 1

y = -2

Explanation:

3x - 4y = 11

3x + y = 1

We time the second equation by -1

3x - 4y = 11

-3x - y = -1

-5y = 10

y = -2

Now we put -2 in for y and solve for x

3x - 4(-2) = 11

3x + 8 = 11

3x = 3

x = 1

Let's Check the answer.

3(1) - 4(-2) = 11

3 + 8 = 11

11 = 11

So, x = 1 and y = -2 is the correct answer.