Please help! im stuck on this question

Solve the system of equations. y= 2x y= x^2 - 15

Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares

What is the reflection image of (5,-3) across the line y = -x?