Please help solve this

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?