Engineering Board Exam Reviewer · Equations of Lines · medium
ECE Board April 1999: If the points (-2,3), (x,y) and (-3,5) lie on a straight line, then the equation of the line is
- x-2y-1=0
- 2x+y-1=0
- x+2y-1=0
- 2x+y+1=0
Answer
D. 2x+y+1=0
Solution
slope = 5-3/-3-(-2) = -2. Line thru (-2,3): y-3=-2(x+2), which simplifies to 2x+y+1=0.
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