Réponses

2013-11-28T17:36:08+01:00
D1 : y= 2x

D2: pente de D2 = (3-2)/(2-1) = 1/1 = 1 
y - 2 = 1(x - 1) => y = x - 1 + 2 => y = x + 1 
bonne soirée