Question

calcular o zero das funcoes a) y= 2x/5 - 1/3

Answer 1

Vamos resolver pela equação substituindo y por 0.
0 = 2x/5 - 1/3
2x/5 = 1/3
2x = 1/3*5
2x = 5/3
X = 5/3/2/1
X = 5/6.

Substitua x pot 5/6 e y será 0.

Answer 2

$y = \frac{2x }{5} - \frac{1}{3} \\ 0 = \frac{2x }{5} - \frac{1}{3} \\ \frac{1}{3} = \frac{2x}{5} \: \: (cruz \: credo) \\ 5 = 6x \\ x = \frac{5}{6}$
PROVA REAL

$0 = \frac{2x}{5} - \frac{1}{3} \\ 0 = \frac{2 \times \frac{5}{6} }{5} - \frac{1}{3} \\ 0 = \frac{ \frac{10}{6} }{5} - \frac{1}{3} \\ 0 = \frac{10}{6} \times \frac{1}{5} - \frac{1}{3} \\ 0 = \frac{ {10}^{ \div 10} }{ {30}^{ \div 10} } - \frac{1}{3} \\ 0 = \frac{1}{3} - \frac{1}{3}$