Hello there! you can use the expression [tex]\frac{ y_{1}-y_{2}}{x_{1}-x_{2} }[/tex]!
To find slope, subtract the y values over the x values.
In this case:
2 - - 1 / - 3 - 7
3 / -10
So, -3/10 would be the slope of these points.
Hope this helps, have a great day!