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Sagot :

Réponse :

Bsr,

z = 3 x - 2 y = 3 (3 t - 5) - 2 (4 t + 2) = 9 t - 15 - 8 t - 4 = t - 19

x = 3 t - 5 ⇔ t = (x + 5)/3

y = 4 t + 2 = 4 (x + 5)/3 + 2 = 4/3 x + 20/3 + 6/3 = 4/3 x + 26/3

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