40 points is (4,7) a solution of equations? explain your answer 2x+4y=36 3x-4y=-6

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Can someone me out here and the tell me the greatest common factor

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.