Question 942015


Lines 2 and 4 are perpendicular.


line 2  
{{{y=(1/4)x-1}}} => slope {{{(1/4)}}}

and line 4

{{{y=-4(x+1)}}} => slope {{{-4}}}

{{{(1/4)}}} is negative reciprocal of {{{-4}}}


{{{ graph( 600, 600, -10, 10, -10, 10, (1/4)x-1, -4(x+1)) }}}