1.

A = (4, 2); B = (1, y) and AB = 5 then y = ……………. A) 6 B) 3 C) 9 D) 2

Answer»

Correct option is (A) 6

We have A = (4, 2), B = (1, y) and AB = 5

\(\Rightarrow\sqrt{(1-4)^2+(y-2)^2}=5\)

\(\Rightarrow(-3)^2+(y-2)^2=5^2=25\)        (By squaring both sides)

\(\Rightarrow(y-2)^2=25-9=16^2=4^2\)

\(\Rightarrow y-2=4\;or\;y-2=-4\)

\(\Rightarrow y=4+2=6\;or\;y=-4+2=-2\)

Correct option is A) 6



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