Jacob is seven years younger than twice Elizabeth's age. The sum of three times Jacob's age and two times Elizabeth's te is 19, How old is Jacob?
+591 we can say Jacob's age is J, and Elizabeth's age is E. this means
2E-7=J
3J+2E=19
subtract the 1st equation from the secnd:
3J+7=19-J
4J=12
J=$\boxed{3}$
