What’s 4(60+78)-9, I need help, I’m having a brain fart

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t

Which function has the domain x> -11