How do you graph X>=4y?

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal