Straight line
Explaintion .
The correct numbers are 55 and 47, because they have a difference of 8 and a sum of 102.
It is Constant. The cost per pound is 2.50 dollars. two would be on the x-axis, and 5 dollars would be on the y-axis. likewise, 3 would be on the x-axis, and 7.50 dollars is on the y-axis. 5 pounds would cost : $12.50