Question 105783
You need to get to a form of the equation where y is on one side and everything else is on the other. 
{{{y=...}}}
You get to use your properties to get there. 
{{{-8x-5y=-45}}}
{{{cross(-8x)+cross(8x)-5y=-45+8x}}} Additive inverse of (-8x) of 8x to both sides.
{{{-5y=-45+8x}}} Simplify.
{{{cross(-5)y/cross(-5)=(-45+8x)/(-5)}}} Multiplicative inverse of (-5) or (-1/5) to both sides. 
{{{y=(-45+8x)/(-5)}}} Simplify left hand side. 
{{{y=-45/-5+8x/(-5)}}} Distributive property. 
{{{y=9-8x/5}}}

Now it is in a form where y is a function of x.
{{{y(x)=9-8x/5}}}