For this case we have that by definition, the slope of a line is given by:
[tex]m = \frac {y_ {2} -y_ {1}} {x_ {2} -x_ {1}}[/tex]
We have as data that:
[tex](x_ {1}, y_ {1}) :( 2.1; -3.2)\\(x_ {2}, y_ {2}): (- 1.5; 1.6)[/tex]
Substituting the data:
[tex]m = \frac {1.6 - (- 3.2)} {- 1.5-2.1} = \frac {1.6 + 3.2} {- 3.6} = \frac {4.8} {- 3.6} = - 1.33[/tex]
Answer:
-1.33
