Round 90.69 to the nearest tenth

Itook a better photo of the question so y’all can see it i hope it’s a fine photo

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Which is the focus of a parabola with equation y2=4x