Question

Suppose that it costs ​$40 to place a classified advertisement in the​ newspaper, plus ​$5 for each line. Then the cost to place an ad x lines long is given by y​ dollars, where y equals 5 x plus 40. Express as an ordered pair the fact that a 17 line ad costs ​$125.

Answer 1

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