Which equation represents a linear function? y(x – 1) = 9 y – 5 = x(–x + 2) y(y – 1) = x + 25 y – 5 = x – 20

The linear function: y = mx + b.

y(x - 1) = 9 → xy - y = 9   NOT (xy)

y - 5 = x(-x + 2) → y - 5 = -x² + 2x   NOT (x²)

y(y - 1) = x + 25 → y² - y = x + 25   NOT  (y²)

y - 5 = x - 20 → y = x - 15   YES

use formula for the circle a=3.14

step-by-step explanation:

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step-by-step explanation: