Jenna must run a total of 12 miles on Monday. Jenna ran 356 miles in the morning and 4112 miles in the afternoon.

How many miles does Jenna still need to run before the end of the day?

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