1. We need to find the equation of the line.
y = mx + b
b = - 1
m = rise/run = 3/1
y= 3x - 1
2. The colored part is under the line, so it should be
y ≤ 3x - 1
Check:
Take points that is in the colored area. For example (2,0).
y ≤ 3x - 1,
0 ≤ 3*2 - 1, 0≤ 5. True.
Answer: y ≤ 3x - 1.
