Question

Solve each proportion 3/39= y/13

Answer 1

Answer:

$y = 1$

Step-by-step explanation:

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

Cross multiply

$39 = 39y$

Divide by 39

$y = 1$

Answer 2

Answer:

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

Step-by-step 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.