What is the perimeter of the triangle?

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

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

F(x)=5/6x+3 which of the following is true