Gradient(slope) m = y2−y1x2−x1\frac{y_2 - y_1}{x_2 - x_1}x2−x1y2−y1
the points are (12,−13) and (3,23)\left(\frac{1}{2}, -\frac{1}{3}\right) \text{ and } \left(3, \frac{2}{3}\right)(21,−31) and (3,32)
m = 23−(−13)3−12\frac{ \frac{2}{3} - \left(-\frac{1}{3}\right) }{ 3 - \frac{1}{2} }3−2132−(−31)
= 23+133−12\frac{ \frac{2}{3} + \frac{1}{3} }{ 3 - \frac{1}{2} }3−2132+31
= 1÷521 \div \frac{5}{2}1÷25 = 1×251 \times \frac{2}{5}1×52
Therefore, m = 25\frac{2}{5}52