Respuesta :

21xyz/28yz=[(7yz)(3x)] / [(7yz)(4)]=3x/4

Answer: 21xyz/28yz=3x/4
olemakpadu
21xyz / 28yz

The yz at the top cancels out the yz at the bottom

21x / 28

7 into 21 is 3, and 7 into 28 is 4

3x / 4

= 3x / 4.

I hope this helps.