Finding the Measure of Angles from Intersecting Lines

In a geometric figure, two lines intersect, creating several angles. The measures of three angles are given as follows: angle 1 measures $70$ degrees, angle 2 measures $x$ degrees, and angle 3 measures $40$ degrees. If angle 2 is the angle opposite to angle 3, what is the measure of angle 2?

Keep in mind that the angles opposite each other at an intersection are equal.