What’s the first step to solving -2x+7

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

Ihave trouble finding the nth term of a linear sequence

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.