slope of a line (-1,0),(1,0)
\(\text{Slope } = \frac{ y_2 - y_1 } { x_2 - x_1 } \\ \\ \frac{0 - 0}{ 1 - -1} \\\\ \frac{0 + 0 }{ 1 + 1} \\\\ \frac{0}{ 2}\\\\\boxed{\bf{0}}\)The slope isĀ 0.