4v over 27 equals to 16

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

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Which statement about the annual percentage rate (apr) is not true?