The number of years since 2000 is x and the percent of people using travel services is y.

The percent of people using travel agent .

The percent of people using internet .

Graph the equations on the coordinate plane which contain number of years on the x - coordinate and percent of people on the y - axis, and find the intersection point.

Observe the graph, the graph appear intersect at .

The travel agent and the Internet are equal. Therefore

Apply addition property of equality : If then .

Add 2x from each side.

.

Apply commutative property of addition: .

Apply subtraction property of equality : If then .

Add 41 from each side.

Apply division property of equality : If then .

Divide each side by 8.

Cancel common terms.

.

The solution are

(a) The equations and and their graph is

(b) The travel agent and the Internet are equal when .