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The straight line a x+b y+c=0 , where a ...

The straight line `a x+b y+c=0` , where `a b c!=0,` will pass through the first quadrant if (a) `a c >0,b c >0` (b) `ac >0 or b c<0` (c)`b c >0` or `a c >0` (d) `a c<0` or `b c<0`

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