Question

Dada a funçao afim f (x)= 2x+3, determine: a) F(x)= 1/3 (1 sobre o 3)

Answer 1

Para calcular o $f(x) = \frac{1}{3}$ de $f(x) = 2x+3$, basta substituir o $f(x)$ por $\frac{1}{3}$, em que se obtém:

$f(x) = 2x+3 \\\\ f(x) = \frac{1}{3} \\\\ \frac{1}{3} = 2x+3 \\\\ 1 = 3(2x + 3) \\\\ 1 = 6x + 9 \\\\ 1 - 9 = 6x \\\\ -8 = 6x \\\\ x = -\frac{8}{6} \\\\ x = -\frac{4}{3}$