What is the missing term in 1,2,5,10, __,26,37

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

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

3x + 4y = 5 x- 3y = -7 solve by substitution