It is recommended that you drink 8 cups of water a day how many gallons does a 8 cups of water equal

Answer this question only if you know the answer! 30 points and

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

Someone me! if you’re smart you can solve this!