word problems

Question

variable y varies directly with variable X. If X=12, y=3. What is the value of y when X=8?

Answer 1

varies directly looks like this: y = mx where m is the slope

 

If x = 12 and y = 3, then 3 = 12 m, so m = 1/4

 

now, you have y = 1/4 x

 

So, if x = 8, then y = 8(1/4) = 2  Y=2