Respuesta :

I'm not sure how to do #14 but I can help with #15.

15) C (4,-6)

3x - y = 18
3(4) - -6 = 18
12 - -6 = 18
18 = 18

4x + y = 10
4(4) + -6 = 10
16 + - 6 = 10
10 = 10

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