algebra
posted by caduceus .
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

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