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Problem 18 - Entrance Test

A line passes through the points (1, 2) and (3, 8). What is the equation of the line?

Correct: A

The slope of the line is (8-2)/(3-1) = 6/2 = 3. Using the point-slope form, y - 2 = 3(x - 1), so y - 2 = 3x - 3. Therefore, y = 3x - 1.