1. In 2009 research showed that the United States and Japan topped the charts in number of social media and blog users, with a combined number of 188,610 users. The number of social media and blog users in the U. S. was 2,378 more than three times the number of social media and blog users in Japan. Write a system of equations that models the number of social media and blog users for the U. S. and Japan. Let x represent the number of users in the U. S., and let y represent the number of users in Japan. Write the equations and solve. How many users are there in each country?

2. Currently, Jacob’s mother is three more than nine times as old as Jacob. In eleven years, his mother will be five more than three times his age. Write a system of linear equations that models this situation. Let j represent Jacob's age, and let m represent his mother's age.
Write an equation that relates Jacob and his mother's current ages. Solve the system of equations.
What are their ages?

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4. The sum of seven times a number and three times a second number is 54. If the first number is two more than the second number, what are the two numbers? Write a system of equations that can be used to find the numbers. Let x represent the first number, and let y represent the second number. Solve the system of equations. The two numbers are?

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