I need some step my step notes on how to solve systems of equations

I’m which figure is point g an orthocenter

Write an equation in point-slope form for the line through the given point that has the given slope (-2,-7); m=-3/2

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad