Question

A yearbook printer charges based on the number of pages printed. Here is a table that shows the cost of some recent yearbooks:

Chart with two rows and four columns. The first row is labeled Number of Pages and contains the number fifty in the first column, one hundred in the second column, one hundred fifty in the third column, and two hundred in the fourth column. The second row is labeled Cost and contains the numbers one point two five in the first column, one point eight five in the second column, two point four five in the third column, and three point zero five in the fourth column.
Which equation gives the cost, y, in terms of the number of pages, x?

Answer 1

y = 0.012x + 0.65

Number of pages 50.00 100.00 150.00 200.00
Cost 1.25 1.85 2.45 3.05

x = number of pages
y = cost

intervals of x = 50 pages
intervals of y = 0.60
0.60 / 50 = 0.012

y = 0.012x + 0.65

x 0.012*x y
0.012 50 0.60 0.65 1.25
0.012 100 1.20 0.65 1.85
0.012 150 1.80 0.65 2.45
0.012 200 2.40 0.65 3.05