..., -. These equations become, by multiplication and transposition, Эх — 2 у = 30, and За; — 2 у = 10, in which the first members are identical,...subtracting and canceling the terms containing y, we have 3 ж — 3 x = 20, or 0 . x = 20, and x = - 2 /. Or, by subtracting and canceling the terms containing...