we have two points, first, we need to calculate the slope with the next formula
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
where
(-2.5,1)=(x1,y1)
(-0.5,4)=(x2,y2)
we substitute the values on the formula
[tex]m=\frac{4-1}{-0.5+2.5}=\frac{3}{2}=1.5[/tex]
the answer is 1.5
