Angles 1 and 3 are vertical lines and because they are vertical, both angles equal each other.
Answer:
a straight line that does not go through the origin.
Let a and c represent, respectively, the price of an adult and a child ticket. We know that

Multiply the first equation by 3 and the second equation by 2 to get

Subtract the two equations to have

Plug this value in the first equation to get
