Asked by Billy

Are these two equations perpendicular when graphed?
y=9x-2 and 3y=7-x
Answered by Reiny
Mmmmhhh?

Do you know how to read off the slope if the equation is in the form
y = mx + b ?? (one is already in that form)

Is one slope the negative reciprocal of the other ??
Answered by Billy
I think that both are not perpendicular to each other when graphed.
Answered by Reiny
correct, one has a slope of 9, the other a slope of -1/3
9 * -1/3 ≠ -1
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