Question 326096
Parallel lines have identical slopes.
Perpendicular lines have slopes that are negative reciprocals.
{{{m1*m2=-1}}}
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{{{m1=1}}}
{{{m2=-1}}}
They are not parallel.
{{{m1*m2=1(-1)=-1}}}
They are perpendicular.
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{{{graph(300,300,-10,10,-10,10,x+7,-x+2)}}}