Which of the following pair of points lie on either side of the line 4x-y+5=0? a)(0,0)(1,1). b)(0,7)(1,12). c)(5,1)(-2,1). d)(-1,2)(2,1)
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put 0,0 and 1,1 in eqn=4x-y+5=0
={4(0)-(0)+5} {4(1)-1+5}
=5 × 8= 40
as product is positive, so both points (0,0) and (1,1) lie on same side of line 4x-y+5=0 .
if product is negative,that means given points lie on opposite(eiher) side of given line eqn...
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