Y is directly proportional to x. When y=30, x=6. What is the value of y when x= 12

The value of y when x = 12 is equal to 60.

Step-by-step explanation:

Since, y is directly proportional to x, then it can be written as follows.

y ∝ x

y = kx                                 ... (1)

It is given that when y =30 and x = 6 then y is directly proportional to x.

Substitute 30 for y and 6 for x in equation (1) as follows:

30 = k(6)

k =  

k = 5

To obtain the value of y if x = 12, then substitute 12 for x and 5 for k in equation (1) as follows:

y = 5(12)

y = 60

Therefore, the value of y when x = 12 is equal to 60.

hope this helped :)

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168