Which of the following describes a relationship defined by the formula
y = 4x - 9?
For any value of Δx measured away from the point (0, -9) in the relationship, Δy = 4Δx.
The point (2, -1) in the relationship conveys that 2 = 4(-1) - 9.
Given any point (x, y) in the relationship, y is always 4 times as large as x.
Given any two points in the relationship (x1, y1) and (x2, y2), (y2 - y1)/(x2 - x1) = 4.
The point (2, -1) in the relationship conveys that -1 = 4(2) - 9.