Question

Solve the proportion by using cross product: 5/n+3 = 7/4​

Answer 1

-1/7=n

Explanation:

We can use cross products to solve

5 7

-------- = ------

n+3 4

5*4 = 7*(n+3)

20 = 7*(n+3)

Distribute

20 = 7n+21

subtract 21 from each side

20-21 = 7n+21-21

-1 = 7n

Divide each side by 7

-1/7 = 7n/7

-1/7=n