Question 1005383
Substitution method; solve either equation if necessary, for either variable and substitute into the other equation.  Your exercise gives two formulas for y, so they can simply be equated, and solve for x.


You would eventually find for x using general solution for quadratic equation, 
{{{x=(4+- 24)/4}}}

{{{x=(1+- 6)}}}

x=-5  or x=7
Find the y which correspond to each of those.