SOLUTION: Determine whether the graphs of the two equations are perpendicular. y=7x-7 3y=7-x Help me please.

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Question 136513: Determine whether the graphs of the two equations are perpendicular.
y=7x-7
3y=7-x
Help me please.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
putting 2nd equation into slope-intercept __ y=(-1/3)x+7/3

if two lines are perpendicular, their slopes are negative reciprocals
__ -1/7 does NOT equal -1/3, so the lines are NOT perpendicular