Just it’s a multiple choice and nobody but yes they are professional no they are not portional

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

We just started the introduction into circles and i have no idea how to do this.

Find the missing factor. write your answer inexponential form.9^2=9^4×