Solve the following systems for "x" and "y" and (in #8) "z". You may check method and answer

System Check Method x + y = 2 x - 3y = 0 Check #1? 2y + 4x = -6 6x - 2y = 16 Check #2? 3x - 4y = -12 5x - 3y = 13 Check #3? 4x + 6y = 8 6x + 9y = 12 Check #4? 4x + 6y = 6 6x + 9y = 12 Check #5? 1 2  x -   1 3  y = 5 1 3  x +   1 4  y = 9 Check #6? y - x = 1 y = x2 - 2x - 9 Check #7? 2x - 2y + 4z = 10 3x - 2y + 2z = 5 4x - 2y + 3z = 9 Check #8?

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