Question 134073
Standard form is {{{ax+by=c}}}


{{{y+3=3(x+5)}}}


Apply the distributive property:


{{{y+3=3x+15}}}


Add -3 to both sides:


{{{y=3x+15-3}}}
{{{y=3x+12}}}


Add -3x to both sides:


{{{-3x+y=12}}}


Done.