What is the slope of the line passing through points (2, 1) and (5, 7)?

What is this equation in point-slope form?

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.