Question 923014
The parallel line compares like this:
{{{ m[1] = m[2] }}}
{{{ m[2] = -5/3 }}} ( same slope )
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The perpendicular line compares like this:
{{{ m[3] = -1/m[1] }}}
{{{ m[3] = -1/((-5/3)) }}}
{{{ m[3] = 3/5 }}}