isn't the product of their slopes = -1 ??
or notice that one slope is the negative reciprocal of the other, so....
the lines are perpendicular.
Decide wheather the pair of lines is parrall, perpendicular or neither.
what is the slope?
5x+4y=6
4x-5y=10
I GOT -5/4 AND 4/5 NEITHER.
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