Question

Y varies directly as x. if x = 7 then y = 21. find y when x = 6

Answer 1

We have directly proportional quantities. We have that

`(y)/(x)=(21)/(7)`

Then, to find y, when x = 6 is

`(y)/(x)=3\rightarrow y=3\cdot x\rightarrow y=3\cdot6\rightarrow y=18`

Then, when x = 6, the value for y = 18.