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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.
Since w = -2 and z = 4, the w can be replaced with -2 and the z replaced with 4:3wz = 3(-2)(4) = -24.
w=lh/v
If you mean: m +Y = w then the value of m = w -Y
what is w if 2w = 16