to eliminate the x terms and solve for y in the fewest steps, by which constants should the equations be multiplied by before adding the equations together? first equation: second equation: the first equation should be multiplied by 3 and the second equation by -5.the first equation should be multiplied by 3 and the second equation by 5.the first equation should be multiplied by 7 and the second equation by -6.the first equation should be multiplied by 7 and the second equation by 6.