Y is directly proportional to x. when y=30, x=6. A) work out an equation connecting y and x. B) work out what the value of y when x=12.

A)Y =k x

               Y =5x

              B.Y=60

Step-by-step explanation:

Given that Y is directly proportional to x

mathematically , it Is represented as

Y ∝ x

Introducing the constant of proportionality, k. we have that

Y =k x

Now when y=30, x=6, k becomes

30=k 6

k=30/6=5

we now have the equation connecting them as

Y =5x

B) Now when x=12, y becomes

Y =5x

Y =5 X 12

Y=60

its 50 miles away from the starting point