Asystem of equations is shown below. 2x + y = 9 x + 3y = -13 which sequence of operations would produce the correct x- or y-value of the solution to this system of equations? multiply the second equation by –1 and add the result to the first equation to eliminate x and solve for y multiply the first equation by –3 and add the result to the second equation to eliminate y and solve for x multiply the second equation by and add the result to the first equation to eliminate the constant and solve for x and y multiply the first equation by 3 and add the result to the second equation to eliminate y and solve for x