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Question Number 46816 by peter frank last updated on 31/Oct/18
Answered by tanmay.chaudhury50@gmail.com last updated on 01/Nov/18
slopeM1=am2−am1a(m2−m1)M1=a(m1−m2)am1m2(m2−m1)=−1m1m2slopeM2=am4−am3a(m4−m3)=−1m3m4M1×M2=−1(sinceline1⊥tosecondline)M1×M2=−1m1m2×−1m3m4=−1hencem1m2m3m4=−1proved
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