bonjour,
f (x) = - 1.5 x - 1
f ( -3) = - 3 * - 1.5 - 1 = 4.5 - 1 = 3.5
f ( - 2) = - 2 * - 1.5 - 1 = 3 - 1.5 = 1.5
f ( - 1) = - 1 * - 1.5 - 1 = 1.5 - 1 = 0.5
f ( 0) = - 1
f ( 1) = - 1.5 - 1 = - 2.5
f ( 2 ) = - 3 - 1 = - 4
les abscisses négatives ont une ordonnée positive et le contraire