If SX = 18, SX² = 324 AND (SX)² = 324. A new variable Y is created by multiplying each X by 2 then subtracting it by 5. What are SY and (SY)² equal to?

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A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.