Respuesta :
Answer:
y = 21/5x
Step-by-step explanation:
y is directly proportional to x
y = kx
Find k constant.
21 = 5k
21/5 = k
Plug k as 21/5.
y = 21/5x
Answer:
y=21/5x
Step-by-step explanation:
When y is 21, x is 5.
5(21/5)=21, so we have y=21/5x