Line JK passes through points J(–4, –5) and K(–6, 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 J and K is (3 − (−5))/(−6 − (−4)) = 8/(−2) = −4. Substitute J(−4, −5) into y = −4x + b: −5 = 16 + b, so b = −21, choice A.

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