SOLUTION: find the value of k if 3x-4y+2 is perpendicular to 5x+ky+7. Please hurry! Thank you

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Question 996718: find the value of k if 3x-4y+2 is perpendicular to 5x+ky+7. Please hurry! Thank you
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Are the expressions equal to 0?

Lines system%283x-4y%2B2=0%2C5x%2Bky%2B7=0%29 and their slopes are system%283%2F4%2C-5%2Fk%29.

Those slopes must conform to %283%2F4%29%28-5%2Fk%29=-1 to make the lines be perpendicular.