Answer:
a)(1.5,-4) true , (-4,-4) false / b) (0,-5) and (2,-4) are false and the other 2 is true / c) shade under the line d) they are not included because they are if you take any point on the line ot won't be less that 15
Explanation:
in a) you substitute the x and the y to the equation and check if they are equal to 15 , b) you do the same thing but this time you check if its under 15 c) its less than so its below the line , d) already answered