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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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