Question

Fie functia f : R-> R; f(x)=3x + a
Determinati a ∈ R pentru care A(-2; -3) ∈ Gf

Answer 1

f (-2)= 3* (-2) + a = -3 <=> -6+ a = -3 <=> a= -3 + 6 <=> a=3

Answer 2

A(-2 ; -3) ∈ Gf <=> f(-2) = -3
f(-2) = -6+a
-6+a=-3
a= -3+6
a= 3