Put it in slope form: y=mx+b
8y= 4x-16
Divide by 8
Y = 1/2x -2
1/2 is x intercept and -2 is y intercept
Here is how to solve it with long division and synthetic division.
0, 1/3, 2/3, 1, 1 1/3, 1 2/3, 2
Hope these help but i wrote all of it out with all its geometrical reasons
12%
40% = 0.4
30 = 0.3
0.3 x 0.4 = 0.12
0.12 = 12%