Solve the following system of equations by the substitution method. 8x = 2y + 5 3x = y + 7 what is the solution set?

Don't know how to find x given these segment lengths

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?