Question

Fie functia f : R -> R, f(x) = 3x - 1. Determinatinati punctul de pe grafic ce are:
a) ordonata egala cu -4
b) abscisa egala cu -2
c) coordonatele egala
d) ordonata egala cu opusa absicisei
e) ordonata egala cu dublul abscisei

Answer 1

a) ordonata=-4 => f(x)=-4=>3x-1=-4-=>3x=-3=>x=-1 =>A(-1;-4) b)abscisa=-2=>f(-2)=-6-1=-7=>B(-2;-7) c)f(a)=a=>3a-1=a=>2a=1=>a=1/2=>C(1/2;1/2) d) f(a) =-a=>3a-1=-a=>4a=1=>a=1/4=>D(1/4;-1/4) e) f(a)=2a=>3a-1=2a=>a=1=>E(1;2)