SOLUTION: Determine whether graphs are perpendicular: 9x-8y=7 9y-8x=4 Are they perpendicular

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Question 278609: Determine whether graphs are perpendicular:
9x-8y=7
9y-8x=4
Are they perpendicular
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
9x-8y=7
9y-8x=4
.
9x-8y=7
-8y=-9x+7
y=9x/8 - 7/8
.
9y-8x=4
9y=8x+4
y=8x/9 + 4/9
.
No, because in order to be perpendicular m (slope) has to be the negative reciprocal of the slope of the other equation in the slope intercept form and these are not.
.
Ed
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