Answer:
b
Step-by-step explanation:
Sum = <span>ax + by + c + 2ax - 3by + c + by - c
Adding and cancelling the like terms
Sum = 3 </span><span>ax - by + c
</span><span>a. 3ax - by + c</span>
So you should label the x axis and y axis like I did then you use the formula!