[tex]\displaystyle\bf\\1)\\\\\frac{y^{2} -y}{y^{2} } =\frac{y\cdot(y-1)}{y^{2} } =\frac{y-1}{y} \\\\2)\\\\\frac{x^{2} +3x}{x^{2} -9} =\frac{x\cdot(x+3)}{x^{2} -3^{2} } =\frac{x\cdot(x+3)}{(x+3)\cdot(x-3)} =\frac{x}{x-3}[/tex]