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6x - 12 = 3x + 15 3x = 27 x = 9
The phrase "varies directly as" means that there is a number k such that w = k(2x - 1). From the results given for w = 9 when x = 2, 9 = k(4 - 1), or k = 3. Then when w is 15, 15 = 3(2x - 1), or 15 = 6x - 3, or 6x = 15 + 3, or x = 18/6 = 3.
X=5
7+x=15 x=8
If 5 x equals 9 plus 2x then x equals?