x-y=0
x^2 + y^2= 18
where do I start
$\displaystyle x - y = 0$
$\displaystyle x^2 + y^2 = 18$
Solve the top equation for y:
$\displaystyle y = x$
Insert this into the second equation:
$\displaystyle x^2 + (x)^2 = 18$
Solve for x. When you are done, put these x values into the y = x equation to get your y values.
-Dan