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:
[tex]y\text{ = }\frac{12\text{ x 6}}{18}\text{ = 4}[/tex]Then, we can conclude that when x = 12 then y = 4.
