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Sagot :

AZAXTRA

1. a) (yB - yA)/(xA - xB) = 2/2 = 1
    b) f(3) = 1 et f(5) = 3
    c) 9a+3b+10 = 1 et (25a+5b+10)/3 = 3
          9a+3b = -9 et 25a+5b = -1
            3a+b = -3 et 5a+b = -1/5
        2a = 14/5 donne a = 7/5
        b = -36/5

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