Solve the following systems of equations. You may use substitution or elimination. Have these on loose-leaf to turn in.
1.) 2x + 5y = 8
3x + 2y = 12
2.) 7x + 3y = 3
21x + 9y = 15
3.) 7x + 2y = 16
8x -4y = 56
4.) -6x + 8y = 18
-5x - 4y = -9
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