Solve the system of equations below by graphing both equations with a pencil and paper. what is the solution? y = -x + 21 y = -2x + 30

Equation for the calculation double 2 and then add 5

Which of the following can be used to explain a statement in a geometric proof?

Which function has an inverse that is also a function? a.{(-4,3), (-2, 7), (-1,0), (4, -3), (11, -7)} b.{(-4, 6), (-2, 2), (-1, 6), (4,2), (11, 2)} c.{(-4,5), (-2, 9), (-1,8), (4, 8), (11,4)} d.{(-4,4), (-2, -1), (-1,0), (4, 1), (11, 1)}