SOLUTION: in each case determine whether the lines are parallel, perpendicular or neither.. y=x+7 y=-x+2

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Question 219612: in each case determine whether the lines are parallel, perpendicular or neither..
y=x+7
y=-x+2
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
y=x+7 (red line)
y=-x+2 (green line)
These two equations are perpendicular because their slopes are negative recipricals of each other. (1 & -1)
+graph%28+300%2C+300%2C+-10%2C+10%2C+-10%2C+10%2C+x+%2B7%2C+-x+%2B2+%29+ (graph 300x300 pixels, x from -10 to 10, y from -10 to 10, of TWO functions x +7 and -x +2).