Mila's mother gave birth to a little girl. Six weeks later, Mila's family adopted a puppy who was
bom on the same day as the baby. Assume that both the baby and puppy gain weight at a
constant rate for the first half year of their lives.
When the baby was born, she weighed 8 pounds. At 24 weeks, she weighed 14 pounds.
When the puppy was adopted, he was 6 weeks old and weighed 13 pounds. At 15 weeks, he
weighed 31 pounds.

Define the variables and include units(x represent and y represents) then write equations to represent the situation.