Step-by-step explanation:
Slope, which is the same as gradient, is equal to
change in y axis ÷change in x axis
Our coordinates are (-12,-12) and (9,-9)
In (-12,-12),let the first -12 be x1 and the second one be y1
Same goes for the (9,-9), let 9 be X2 and -9l be y2
[tex]slope = \frac{y2 - y1}{x2 - x1} [/tex]
[tex] = - \frac{ - 9 - - 12}{9 - 12} [/tex]
[tex] = \frac{3}{21} [/tex]
=0.1428571429
= 0.1429
