The Congo river in africa is long.

The Congo river is longer than the Niger river.

a.

Write an equation could use to find the length of the Niger river.

The length of the Congo river is longer than the Niger river.

Write a proportion for the given data.

.

This is the equation could use to find the length of the Niger river.

b.

Let be the length of the Niger river.

The length of the Congo river is longer than the Niger river.

Write a proportion for the given data.

                               (Original equation)

      (Subtract from each side.)

                               (Apply additive inverse property : )

                                           (Simplify)

Therefore, the lenght of the Niger river is .

a. The equation could use to find the length of the Niger river is .

b. The lenght of the Niger river is .