Solve the system: x + y = 5; x - y = 1. What is x?

Solve using elimination: 2x + y = 7; x - y = 2. What is y?

Using substitution, solve: y = 2x; x + y = 9. What is x?

A train travels 150 miles in 3 hours. What's its speed (in mph)?

Two numbers add up to 20 and their difference is 4. What are the numbers?

The sum of two consecutive even numbers is 38. Find the larger number.

A rectangle's length is 5 more than its width. The perimeter is 34. What's the length?

Solve: 3x - 2y = 1; x + y = 4. What is x?

Tickets cost $5 for adults and $3 for children. 100 tickets were sold for $400. How many adult tickets were sold?

A boat travels 60 km downstream in 3 hours and 60 km upstream in 5 hours. Find the speed of the boat in still water.