Question

The variables y and x have a proportional relationship, and y = 15 when x = 3. What is the value of x when y = 4?

Answer 1

Answer:

$x=\frac{4}{5}=0.8$

Step-by-step explanation:

We have been given that the variables y and x have a proportional relationship, therefore, we can represent the relationship between x and y as: $y=kx$, where k is proportionality constant.

Let us substitute x=3 and y=15 in above equation to find the value of k.

$15=k*3$

$k=\frac{15}{3}$

$k=5$

Now let us substitute k=5 and y=4 in our proportionality equation to find the corresponding value of x.

$4=5x$

$x=\frac{4}{5}$

$x=0.8$

Therefore, the value of x will be 0.8, when y equals to 4.

Answer 2

Answer:

The answer is 0.8

Step-by-step explanation:

divide 15 / 3 = 5

then divide 4 / 0.8 that equals 5