Question 168985
Hi, Hope I can help,
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parallel, perpendicular or neither: 
{{{ y=x+7 }}}
{{{ y=(-x)+2 }}}
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These equations are in the form of {{{ y = mx + b }}}, 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)
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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 {{{ 1 }}}, if you put a negative on it, it would be {{{ -1 }}}, which is equal to the second slope
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Reciprocal of the second slope would be {{{ - 1 }}}, if you put a negative on it, it would be {{{ 1 }}}, 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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{{{ graph ( 350,350,-10,10,-10,10, x + 7, -x + 2) }}}
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Hope I helped, Levi