Hi,

y = x+7,  y = -x+2

are these lines parallel,perpendicular, or neither

*Note: Parallel lines have the smar slope, perpendicular line the slopes

are negative reciprocals of one another.

standard slope intercept form is y = mx + b 

y = x+7 is the  same as y = (1/1)m +7 and it's slope is 1/1

y = -x+2 is the  same as y = (-1/1)x + 2

Slopes are negative reciprocals, the lines are perpendicular.

Using a t-table listing at least three points for each line and graphing the

lines  would also show the lines to be perpendicular

 

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