Suppose that it costs $40 to place a classified advertisement in the newspaper, plus $2 for each line. Then the cost to place an ad x lines long is given by y dollars, where. y=2x+40.

An order pair is expressed as (x, y)

so if x represent lines, and there are 15 lines

then x = 15

and if y represents dollars, and there are 70 dollars

then y = 70

which you would plug into (x, y) to get the ordered pair (15, 70)

Now express as an ordered pair the fact that an ad costing $60 is 10 lines long