Stvu is an isosceles trapezoid. if sv = 3x + 1 and tu = x + 21, find the value of x.

Just tell me how to set up the equation.

Ineed someone to me answer my question i have to have this done and knocked out

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)