Alyssa works as a sales representative in an electronics store. She earns a fixed daily wage plus a commission on the sales she makes. The table shows her earnings based on the amount of sales she makes in a day.

Total Sales ($) Daily Earnings ($)
0 80
200 110
500 155
800 200
1,200 260
The equation that gives Alyssa's daily earnings based on her total sales is .
When this data is plotted on a graph with a line connecting all the points, the y-intercept of the line represents and the slope of the equation represents .
In this scenario, the y-intercept is .