In order to solve the following system of equations by addition, which of thefollowing could you do before adding the equations so that one variable willbe eliminated when you add them? 4x – 2y=73x – 3y=15a. multiply the top equation by-3 and the bottom equation by 2b. multiply the top equation by 3 and the bottom equation by 2c. multiply the top equation by 1/3d. multiply the top equation by 3 and the bottom equation by 4