algebra

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Which equation produces a line that is perpendicular to the line represented by the function below?
y = 2/5x + 9

A. 5x + 2y = 4
B. 2x - 5y = 8
C. 5x - 2y = -3
D. 2x + 5y = -7

• algebra -

so the new line has slope -5/2

You should memorize that the slope of
Ax + By = C is -A/B

I see only one equation where -A/B = -5/2

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