Question

Solve using substitution -9x+7y=-15 and -8x+y=18​

Answer 1

x = 51/28

y= 24/7

Explanation:

Answer 2

x=-3, y=-6. (-3, -6).

Explanation:

-9x+7y=-15

-8x+y=18

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y=18-(-8x)=18+8x=8x+18

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-9x+7(8x+18)=-15

-9x+56x+126=-15

47x+126=-15

47x=-15-126

47x=-141

x=-141/47

x=-3

-8(-3)+y=18

24+y=18

y=18-24=-6

x=-3, y=-6.