Question

Teorema de Tales: Na figura abaixo, determine o valor de y e marque a resposta correta:

Answer 1

Olá!

Basta multiplicar cruzado e isolar y.

Fica assim:

$\dfrac{5}{y} =\dfrac{8}{10} ~~~\to ~~~5\cdot10=y\cdot 8~~~\to ~~~8y=50~~~\to ~~~y=\dfrac{50}{8}~~~simplifica~~por~~2$  

$\boxed{y=\dfrac{25}{4}}$

:)

Answer 2

Oie, Td Bom?!

5/y = 8/10

5/y = [8 ÷ 2]/[10 ÷ 2]

5/y = 4/5

5 . 5 = 4y

25 = 4y

4y = 25

y = 25/4

Att. Makaveli1996