Which statement correctly explains how dana can solve the following system of linear equations for x using the elimination method? 4x+8y=20 -4x+2y= -30 add the two equations, solve for y, and then substitute –1 for y to find x. multiply the bottom equation by –4, solve for y, and then substitute –1 for y to find x. multiply the bottom equation by –1, combine the two equations, solve for y, and then substitute 1 for y to find x. multiply the two equations, solve for y, and then substitute 1 for y to find x.