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T = 3x + 7y; x = 4; y = 6

T = 3x + 7y (substitute 4 for x, and 6 for y)
T = 3(4) + 7(6) = 12 + 42 = 54

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Q: If T equals 3x plus 7y what is T when x equals 4 and y equals 6?
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