5 less than 3 times a number y. Please help.

Acircular hot tub located near the middle of a rectangular patio has a diameter of 48 inches. the patio measures 11 feet by 6 feet. what is the area of the patio that is not covered by the hot tub?

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Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}