y varies jointly with x^3 and z and varies inversely with r^2. What is the effect on y when x is doubled and z is cut in half

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

Give me the equations of two lines that have the same slope but are not parallel.

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x