Question

x2+y2=13 where y=2

Answer 1

It would be helpful if we knew what you needed to do here.

Based on the given information, it seems we simply need to swap \(y\) for \(2\) and then solve for \(x\).

x^2 + y^2 = 13; y=2
x^2 + (2)^2 = 13

Then simply continue to solving for x.