Answer:
y = 15
Step-by-step explanation:
Given: y varies directly with x, x=4 when y=20
To find: y when x = 3
Solution:
As y varies directly as x, it means that as x increases, y also increases by the same factor.
As y varies directly with x,
[tex]y=kx[/tex]
Here, k is a constant
As x = 4 when y = 20,
[tex]20=4k\\k=\frac{20}{4}=5\\\Rightarrow y=5x[/tex]
Put x = 3
[tex]y= 5(3) = 15[/tex]
