Find the slope of the line passing through (5,8) and (-4,6)

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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.

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