Question

Solve each proportion 3/39= y/13

Answer 1

`y = 1`

Explanation:

`(3)/(39) = (y)/(13)`

Cross multiply

`39 = 39y`

Divide by 39

`y = 1`

Answer 2

`\boxed {\boxed {\sf y=1}}`

Explanation:

To solve the proportion, we must solve for the variable. This is done by isolating the variable.

`\frac {3}{39}= \frac {y}{13}`

The variable, y, is being divided by 13. The inverse of division is multiplication. Multiply both sides of the proportion by 13.

`13*\frac {3}{39}= \frac {y}{13}*13`

`13*\frac {3}{39}=y\\1=y`

Another way to solve is by cross multiplying. Multiply the 1st numerator by the 2nd denominator, then the 1st denominator and the 2nd numerator.

`\frac {3}{39}= \frac {y}{13}`

`3*13=39*y\\39=39y`

Divide both sides by 39 to isolate the variable.

`39/39=39y/39 \\1=y`

In this proportion, y is equal to 1.