Q. 3
Prove that for any number x, the point (x, 2x + 3) is on the line joining (–1, 1), (2, 7).
Answer :
Slope of the line 
⇒ Slope of the line = 2
Equation of line :
y - 2 = 2(x - 7)
⇒ 2x - y - 12 = 0
Putting x = x and y = 2x + 3 in the above equation we get
2x - (2x + 3) - 12 = 0
which satisfies the above equation
Hence Proved
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