Answer:
-3
Step-by-step explanation:
pick two points where the line crosses exactly and make a triangle, for example (1,1) and (0,4)
difference in y ÷ difference in x = slope/gradient
difference in y = 4 - 1 = 3
difference in x = 0 - 1 = -1
[tex]\frac{3}{-1}[/tex] = -3
