If (1,2),(-1,b),(-3,-4) are collinear ,then find the value of b
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1/2|1(b+4)-1(-4-2)-3(2-b)|=0
=1/2|b+4+4+2-6+3b|=0
=1/2|4b+4|=0
=1/2*4(b+1)=0
=2(b+1)=0
=b=-1
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