Line CD passes through points C(1, 3) and D(4, –3). If the equation of the line is written in slope-intercept form, y = mx + b, what is the value of b?

The slope through C(1, 3) and D(4, −3) is (−3 − 3)/(4 − 1) = −2. Substitute point C into y = mx + b: 3 = −2(1) + b, so b = 5. The correct choice is D, 5.

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