The answer is actually 3 and 4.

lies between the two consecutive numbers 3 and 4.
I hope this helped! :))
First you have to put it into point-slope form before you can write it in slope-intercept form which is y-y1=m(x-x1)
Y-1=2(x-1)
Distribute the 2 to the x and -1
Y-1=2x-2
Move it all to one side
Y=2x-1
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
I think you times all of the inchs together. 5x3x2=30.
I dont know if i am right tho. Hope this help ya.