Question

The variables y and x have a proportional relationship, and y = 5 when x = 4.

What is the value of x when y = 8?

Enter your answer in the box.

x = ___

Answer 1

If y and x have a proportional relationship, we can write this relationship as:

y = kx

where k is the constant of proportionality. To find the value of k, we can use the given information that y = 5 when x = 4:

5 = k(4)

Solving for k, we get:

k = 5/4

Now that we know the value of k, we can use it to find the value of x when y = 8:

8 = (5/4)x

Solving for x, we get:

x = (8*4)/5

x = 6.4

Therefore, the value of x when y = 8 is 6.4.