Solve one of the equations for "x" or "y" and then solve the system by substitution

Do what it says; solve one of them for y.  I'll do the first one:



Now that we know what y is, we can substitute that into the other equation:



Now distribute:



And simplify:





Now that we know what x is, just put that value into either equation to find y, I'll do the first one since we already solved for y:



And simplify:



Now just put the values into a coordinate pair: