What is the solution to the system of equations?
y=-3x + 6
y = 9
(-21, 9)
(9, -21)
(-1,9)
(9,-1)

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