### Home > A2C > Chapter 7 > Lesson 7.1.4 > Problem 7-56

7-56.

Use slope-intercept form.

Parallel lines have the same slope. Use the point-slope form of the equation of a line.

The slopes of perpendicular lines are opposite reciprocals.

Remember the trigonometric relationships.

How might tangent's relationship to the opposite and adjacent sides relate to the rise and run of the slope?