Which statement correctly explains how mari should find a solution to the following system of linear equations using elimination? mc007-1.jp g multiply the first equation by 7 and the second equation by 2, and then add. multiply the first equation by 3 and the second equation by 5, and then subtract. multiply the first equation by –7 and the second equation by 2, and then add. multiply the first equation by –3 and the second equation by 5, and then add.