Help please
Find the value of x. *

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

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x