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Answered

Ex 2 : Résous les équations suivantes
1) - 2x = 7x-5
2) 3x + 1 = 7 - x
3) 4y - 5 = 9y + 1
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Sagot :

DEDE6352
1) -2x = 7x + 5 | - 7x
-9x = 5 | : 9
-x = 5/9 | * -1
x = -5/9

2) 3x + 1 = 7 -x | + x
4x + 1 = 7 | - 1
4x = 6 | : 4
x = 6/4

3) 4y - 5 = 9y +1 | - 9y
-5y -5 = 1 | + 5
-5y = 6 | : 5
-y = 6/5 | * -1
y = -6/5


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