1. Solve each of the following systems by the Method of Elimination. These two should be relatively easy. Make sure to understand why. (a) x-y=7 x+y=5 (b) 2x+5y=3 -2x-y=5 2. Solve each of the following systems by the Method of Elimination. These will be slightly harder than #1 because you will have to alter one of the equations by multiplication. (a) x-y=15 4x+2y=30 (b) 2x+3y=17 5x+6y=32