SOLUTION: parallel, perpendicular or neither: y=x+7 y=-x+2

Question 168985: parallel, perpendicular or neither:
y=x+7
y=-x+2
Found 2 solutions by checkley77, Electrified_Levi:
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
Because the slopes are negative recipricals of each other then these lines are perpendicular.
y=x+7 (red line)
y=-x+2 (green line)
(graph 300x300 pixels, x from -10 to 5, y from -6 to 10, of TWO functions x +7 and -x +2).
Answer by Electrified_Levi(103) (Show Source): You can put this solution on YOUR website!
Hi, Hope I can help,
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parallel, perpendicular or neither:

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These equations are in the form of , where "m" is the slope, "b" is the y intercept
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The slope of the first line is "1"
The slope of the second line is (-1)
.
If lines are parallel, their slopes would be the same, these lines are not parallel
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If lines are perpendicular, their slopes will be the negative reciprocal of each other
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Reciprocal of the first slope would be , if you put a negative on it, it would be , which is equal to the second slope
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Reciprocal of the second slope would be , if you put a negative on it, it would be , which is the first slope
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These lines are perpendicular ( the numbers after the slopes don't matter, in finding if lines are parallel, perpendicular, or neither ) ( the numbers after the slopes are where the lines cross the y axis )
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Here is the graph of the two lines
.

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Hope I helped, Levi
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