Question 1026609
{{{y=mx+b}}}
{{{y-mx=b}}}
{{{b=y-mx}}}------A formula for the vertical axis intercept


{{{m*(-1/m)=-1}}} for perpendicular lines.



The perpendicular
{{{y=-(1/8)x+(-4-(-1/8)3)}}}


The parallel
{{{y=8x+(-4-8*3)}}}


Simplify each of those.