[tex]\left \{ {{2x-5y=11} \atop {\frac{3}{4} x-2y=4~~\mid \cdot 4}} \right. \\\\\left \{ {{2x-5y=11~~\mid \cdot (-3)} \atop {3x-8y=16~~\mid \cdot 2}} \right. \\\\\left \{ {{-6x+15y=-33} \atop {6x-16y=32}} \right. ~~\mid~~dodaje ~~stronami\\\\-6x+15y+6x-16y=-33+32\\\\15y-16y=-33+32\\\\-y=-1~~\mid \cdot (-1)\\\\y=1\\\\2x-5y=11~~\land~~y=1~~\Rightarrow~~2x-5\cdot 1 =11\\\\2x-5=11\\\\2x=11+5\\\\2x=16~~\mid \div 2\\\\x=8[/tex]
