Hey there!
Slope formula: [tex]\frac{y2-y1}{x2-x1}[/tex]
We have:
... (-1,-1 ) and ( 3,15 )
Inserting these values in the formula.
... [tex]\frac{15-(-1)}{3-(-1)}[/tex]
... [tex]\frac{15+1}{3+1}[/tex]
... [tex]\frac{16}{4}[/tex]
Hence, the slope is '4'.
Hope my answer helps!
