exercice 17 à 23 :c Helllppp .

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a = 2 x + 12
b = 7 y - 28

a = - 6 y - 18
b = 3 b - 24

a = m² - 5 m
b = - t²  - 5 t

a = - 4 y² - 16 y
b = - 2 x² - 16 x

a = 2 x + 18 + 4 x = 6 x + 18
b = 5 y - 3 y - 27 = 2 y - 27

a = - 8 b + 8 + 2 b + 2 = - 6 b + 10
b = - 3 x  + 12 + 6 x - 10 = 3 x + 2

a = - 8 x + 9 + 5 x - 50 = - 3 x - 41
b = - 4 - 6 y + 2 - 2 y = - 8 y - 2