Question

How do I do this problem? (5-8)

Answer 1

5. Answer: (-3, 2)

Explanation:

In order to use the substitution method, you need to solve for one of the variables.

2x + 4y = 2

x + y = -1 → y = -x - 1

2x + 4(-x - 1) = 2

2x - 4x - 4 = 2

-2x - 4 = 2

-2x = 6

x = -3

y = -x - 1

= -(-3) - 1

= 3 - 1

= 2

Check:

2x + 4y = 2

2(-3) + 4(2) = 2

-6 + 8 = 2

2 = 2
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