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Question

If points (a,0),(0,b) and (x,y) are collinear, prove that xa+yb=1.

Solution
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If three points (x1,y1),(x2,y2) and (x3,y3) are collinear, then

∣ ∣x1y11x2y21x3y31∣ ∣=0

∣ ∣xy1a010b1∣ ∣=0

bxay+ab=0bx+ay=ab

xa+yb=1

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