SOLUTION: Determine all values of c so that the lines cy+4x=9 and cy-5x=10 are perpendicular.

Question 902044: Determine all values of c so that the lines cy+4x=9 and cy-5x=10 are perpendicular.
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
Using knowledge of standard form equation for a line, ax+by=k will have slope .

cy+4x=9 has slope .

cy-5x=10 has slope .

The two lines given to be perpendicular requires that the product of the slopes equals negative one, . Solve for c.

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