Question

If y varies directly with x and x=21 and y=14, what is the constant of proportionality?

Answer 1

Y varies directly with x
y = kx

y=14
x=21

14 = 21k


`(14)/(21)` =
`(21k)/(21)`
21 and 21 cancels out


`(2)/(3)` = k

The constant of this proportionality is
`(2)/(3)`