Verify whether the point (2,5) lies on 2x -y+1=0 or not

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Nine people are going to share a 128-ounces bottle of soda. how many ounces will each person get drink? choose the correct equation and answer for this situation

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?