2012
Mathematics
JAMB
Find the equation of the line through the points (-2, 1) and (-1/2, 4)
A.
y = 2x - 3
B.
y = 2x + 5
C.
y = 3x - 2
D.
y = 2x + 1
Correct Answer: y = 2x + 5
Explanation
y − y1/x−x1 = y2 − y1/x2 − x1 y−1/(x−−2) = 4−1/(−1/2 + 2) = y − 1/x + 2 = 3/(3/2) y = 2x + 5
y − y1/x−x1 = y2 − y1/x2 − x1 y−1/(x−−2) = 4−1/(−1/2 + 2) = y − 1/x + 2 = 3/(3/2) y = 2x + 5THIS WEEK's
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