Question 995721
The equation of the line with 

given:
slope {{{m=4}}} 
the point ({{{8}}},{{{4}}}) =({{{x}}},{{{y}}})

so, we have {{{y=mx+b }}}=> {{{4=4*8+b }}}...solve for {{{b}}}

{{{4=32+b }}}

{{{4-32=b }}}

{{{b=-28 }}}

then your equation will be:{{{y=4x-28 }}}

check it on a graph:


{{{drawing( 600, 600, -15, 15, -30, 15,
circle(8,4,.12),locate(8,4,p(8,4)),
circle(0,-28,.2),locate(0.3,-28,b=-28),
 graph( 600, 600, -15, 15, -30, 15, 4x-28)) }}}