What are the y=mx+b equations to the two lines?

Amovie streaming service charges it’s customers $15 a month. martina has $98 saved up. will she have any money left over if she pays for the maximum amount of months she can afford? explain.

I'm confused on this could anyone me and show me what i need to do to solve it.

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points