Question

3x + y = 27 –3x + 4y = –42 (8, –6) (–3, 8) (10, –3) (5, 12)

Answer 1

(10,-3)

Explanation:

3x + y = 27

–3x + 4y = –42

Add the two equations together to eliminate x

3x + y = 27

–3x + 4y = –42

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5y = -15

Divide each side by 5

5y/5 = -15/5

y = -3

Now we can find x

3x+y = 27

Substituting y=-3

3x -3 = 27

3x-3+3 =27+3

3x= 30

Divide by 3

3x/3 = 30/3

x = 10

(10,-3)