$\displaystyle m=- \frac{2}{3}$\displaystyle m=- \frac{2}{3}

$\displaystyle m=-\frac{1}{3}$\displaystyle m=-\frac{1}{3}

$\displaystyle m=\frac{1}{3}$\displaystyle m=\frac{1}{3}

$\displaystyle m=\frac{5}{3}$\displaystyle m=\frac{5}{3}