For the equation y = mx + b, if (3, 7) and (-1, -5) are two points on the line, find b.
A-2
B-1
C2
D3
Answer & Solution
Correct answer: A. -2
Slope m = (7-(-5))/(3-(-1)) = 12/4 = 3. Using y = 3x + b with point (3, 7): 7 = 9 + b → b = -2. (Check with second point: -5 = 3(-1) + (-2) = -3 - 2 = -5 ✓.)
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