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A: 11x = 5y + 80

B: 9x - 15y = 120

A: 11x - 5y = 80

B: 9x - 15y = 120

A: 11x - 5y = 80

B: 3x - 5y = 40

A - B: 8x = 40

x = 5

Now we can plug that value of x into one of the original equations to solve for y:

11(5) - 5y = 80

55 - 5y = 80

-5y = 25

y = -5

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