Which of these shows 9 + 4p rewritten using the commutative property of addition?

4p + 9

9p + 4

9 - 4p

4p - 9

1. Solve the following system using substitution: y = 4x - 7 and y = 2x + 9 (25,8) (8,25) (0,8) 2. Solve each system using elimination: x + y = 10 and - x - 2y = - 14 (-4, 6) (6, 4) (-14, 10)

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