bonjour
a ) 5 x + 4 y = 40 - y
15 + 20 = 40 - 5
35 = 35
b ) 6 xy - 2 y = 5 xy + y
6*3*5 - 2 *5 = 5 *3*5 + 5
90 - 10 = 75 + 5
80 = 80
c) x + y = 4 y - 4 x
3 + 5 = 4*5 - 4*6
15 = 20 - 24
15 ≠ - 4
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bonjour
a ) 5 x + 4 y = 40 - y
15 + 20 = 40 - 5
35 = 35
b ) 6 xy - 2 y = 5 xy + y
6*3*5 - 2 *5 = 5 *3*5 + 5
90 - 10 = 75 + 5
80 = 80
c) x + y = 4 y - 4 x
3 + 5 = 4*5 - 4*6
15 = 20 - 24
15 ≠ - 4