Question

the proportion 15 over 3 equals y over 7 , which number is equal to y in the proportion?

Answer 1

The equation is:

15/3 = y/7

To solve for y, first cross multiply:

15* 7 = 3 *y

Simplify:

105 = 3y

Divide both sides by 3:

y = 105/3

y = 35

Answer 2

For this case we have the following proportion:

$\frac {15} {3} = \frac {y} {7}$

We must find the value of "y".

We look for the value of "y" of the expression multiplying by 7 on both sides of the expression:

$\frac {15} {3} * 7 = y\\y = 35$

Finally, we have the value of "y" in the expression is 35

Answer:

$y = 35$