Question

Write a function rule for the cost of movie tickets shown in the table below. Please show your steps to your solution.

# of Tickets 2 3 5
Cost in $ 17.50 26.25 43.75

Answer 1

making a graph of the points will help us see that the information given is a straight line.

the final answer we will want will be in the form of y=mx+b

Answer 2

y=17.5+b

Answer 3

@DemolisionWolf

Answer 4

close!

we have y=mx+b

we need to find m, its the slope between two points, do you remember how to do this?

Answer 5

y2-y1

Answer 6

y=8.75x+1

Answer 7

@DemolisionWolf

Answer 8

(yx - yx)/(x2 - x1)

Answer 9

yep!

Answer 10

Thanks

Answer 11

now we need to solve for 'b'

Answer 12

take any point (x, y)
plug it into

y=8.75x + b
and solve for 'b'

Answer 13

?