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A line through the origin and (10,4) is shown in the standard (x,y) coordinate plane below. The acute angle between the line and the positive x-axis has measure θ. What is the value of tan θ?

Question

A line through the origin and (10,4) is shown in the standard (x,y) coordinate plane below. The acute angle between the line and the positive x-axis has measure θ. What is the value of tan θ?

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Solution

The line passes through the origin (0,0) and the point (10,4). The slope of the line is given by the change in y divided by the change in x, or (4-0)/(10-0) = 4/10 = 0.4.

In a right triangle, the tangent of an angle is equal to the opposite side divided by the adjacent side. In this case, the angle θ is the angle between the positive x-axis and the line, so the "opposite" side is the change in y (or the rise) and the "adjacent" side is the change in x (or the run).

Therefore, the value of tan θ is equal to the slope of the line, which is 0.4.

This problem has been solved

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