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If points(p,0),(0,q) and (2,2) are collinear,then …

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If points(p,0),(0,q) and (2,2) are collinear,then choose the right option (1) 1/p+1/q=1/2 (2) 1/p-1/q=2 (3) 1/p+1/q=1 (4) 1/p+1/q=3

Posted by Amresh Kumar 6 years, 1 month ago

CBSE > Class 10 > Mathematics

3 answers

Sahil ??? 6 years, 1 month ago

Since the ponts are collinear thus area=0. p(q-2)+0(2-0)+2(0-q)=0 => pq-2p+0+0-2q=0. pq-2p-2q=0 => pq=2p+2q => pq=2(p+q). 1/2=(p+q)/pq => 1/2=p/pq+q/pq =>1/2=1/q+1/p. 1/p+1/q=1/2???

1Thank You

Aadya Singh ? 6 years, 1 month ago

How?

1Thank You

Sahil ??? 6 years, 1 month ago

(1)1/p+1/q=1/2

1Thank You

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