exam Maths Puzzle Numerical Ability

Find the y-intercept.
-x + 3y = 15

A) (5, 0) B) (0, -15) C) (0, 5) D) (-15, 0)

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exam Other Question

lowest terms

u^2+16u+63/u+7 * 1/u+9

i got the answer

u^2+16u+63/u^2+16u+63=1

Is this right? Write the equation of the line with slope and y-intercept (0, 3).