April 2019 1 79 Report
Bonjour,Aidez-moi s'il vous plait

a)3x - y = -9 b) 4x + 5y = -21

-4x + 5y = 23 x + 5y = -9

c) 0,5x - 2y = -10 d) -7x + y = 15

-x + 1,5y = 5 -3x + 2y = 8

MERCI.

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