9. A bank teller has a totalof 124 bills in five-do lar bills and ten-do lar bills. The total value of the money is $840. How many fivead ten-do lar bills does shehave? (SOLVE THIS ONE) Equations:

Number of 5 dollar bills:

Number of 10 dollar bills:

5x + 10y = 124
x + y = 840
5x + 10y = 840
x + y = 124
x+y = 840
x + y = 124
4
44
60
64
80
120

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.