[tex]x\leq \frac{1}{4}\\\\x-\frac{1}{4}\leq 0\\\\y\geq -\frac{1}{3}\\\\y+\frac{1}{3}\geq 0\\\\\\\\(x-\frac{1}{4})(y+\frac{1}{3})\leq 0\\\\xy+\frac{1}{3}x-\frac{1}{4}y-\frac{1}{12}\leq 0\ \ \ |\cdot12\\\\12xy+4x-3y-1\leq 0\\\\12xy+4x-3y\leq 1\\\\==========\\\\a>3b\\\\a-3b>0\\\\a-b-2b>0\\\\a-b>2b\ \ \ |:2b\\\\\frac{a-b}{2b}>1[/tex]
