bonjour
f (7) = - 2 donc f (x) = - 2 /7 x
f ( 21) = 21 * - 2/7 = - 42 /7 = - 6
f ( - 3.5) = - 3.5 * - 2/7 = 1
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bonjour
f (7) = - 2 donc f (x) = - 2 /7 x
f ( 21) = 21 * - 2/7 = - 42 /7 = - 6
f ( - 3.5) = - 3.5 * - 2/7 = 1