Question

Fie functia f: {-4; -3; 0,1,2,5}-> R, f(x)=ax-1.
a) Sa se determine a €R astfel ca (-4;-9)€Gf
b) pentru a=2 sa se scrie multimea Gf si sa se reprezinte geometric. VA ROG AJUTATIMA!

Answer 1

1.(-4, -9) apartine Gf daca f(-4)=-9, -4a-1=-9, -4a=-8, a=2
2. f(x)=2x-1
x=-4    y=f(x)=-9                          A(-4, -9)
x=-3,    y=-7                                 B(-3, -7)
x=0,      y=-1                                C(0,-1)
x=1      y=1                                   D(1,1)
x=2      y=3                                   E(2,3)
x=5      y=9                                   F(5,9)
reprezinta punctele in sistemul de axe xOy si uneste-le