Question

The value of y varies directly with x and y=6 when x=18. find y when x=12

Answer 1

Question:

the value of y varies directly with x and y=6 when x=18. find y when x=12​.

Solution:

Consider the following diagram:

By cross-multiplication we get:

`y\text{ = }\frac{12\text{ x 6}}{18}\text{ = 4}`

Then, we can conclude that when x = 12 then y = 4.