Question: solve each system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express

solve each system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express solution sets.

1 I- y 115:T. - 1= 14 7 -5x + 2y 1311 4x + 5y = :3r + 2y = - 19. -2x + 7y =2x - y = 25 4x + 4y = - 1\fc + 3y = 31. 3x + 9y =

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