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Sagot :

SWNN
Soit A(9,-1) et B(18,-8)

a = (Yb-Ya)/(Xb-Xa) = (-8-(-1))/(18-9) = -7/9

y = -7/9x + b

Prenons: Le point A
Ya = -7/9Xa + b
b = Ya - (-7/9)*Xa
b = -1 + 7/9*9
b = -1 + 7 = 6

y = -7/9x + 6 → fonction affine

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