a and b represent the slopes in the equations. Use the y-mx+b formula to realize this. M is the slope, a or b in this question. The lines both have positive slopes so B or C cannot be the answer. I cant see the image properly, but if the y int is at 0 then A is the answer, but if it is above 0 then D will be your answer.
C, because -9 is wayyyy low and -3.5 is also in the (negative) section but, -9 is lower than -3.5. Then, it's 4.2 because it's in the (positive) section.
D because if we count the number that are divisible by 3 our last one before 1000 is 999 and 999/3 is 333 so there are 333 positive integers that are divisible by 3.
