How to solve:
Find the equation of the line passing through the points (1, 5) and (3, 1).
Slope-intercept form: y = mx + b.
Find m, the slope: m = (1 - 5) / (3 - 1) = -2
Substitute -2 (the slope) in for m: y = -2x + b.
To find b, substitute 1 for x and 5 for y: 5 = -2(1) + b.
Solve for b:
Click here to see how.		 b = 7.
Final answer: y = -2x + 7.

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