$\displaystyle m=- \frac{5}{4}$\displaystyle m=- \frac{5}{4}

$\displaystyle m=- \frac{1}{4}$\displaystyle m=- \frac{1}{4}

$\displaystyle m= \frac{5}{6}$\displaystyle m= \frac{5}{6}

$\displaystyle m= \frac{5}{4}$\displaystyle m= \frac{5}{4}