Explications étape par étape

f(6) = 5

f(6) = 6a

6a = 5

a = 5/6

f(x) = 5/6 x

g(-4) = 8/7

g(-4) = - 4a

- 4a = 8/7

a = 8/7 / ( - 4 ) = 8/7 × ( - 1/4 ) = - 8/28 = - 2/7

g(x) = - 2/7 x

h(2/3) = 5

h(2/3) = 2/3 a

2/3 a = 5

a = 5 / 2/3 = 5 × 3/2 = 15/2 = 7,5

h(x) = 7,5x