is -4x+9y=1 and 9x+4y=12 parallel or perpendicular lines

is -4x+9y=1 and 9x+4y=12 parallel or perpendicular or none
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1 Answer

Rewrite the two equations:

y=(4x+1)/9, y=(-9x+12)/4. The slope of the first is 4/9 and of the second -9/4. The product of these slopes = -1 which means they’re perpendicular.

by Top Rated User (1.1m points)

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