Simultaneous equations (linear)

What you'll learn

1. 1

   Imagine you have two secret numbers, x and y. Together they make a puzzle: x + y = 10 and x − y = 2.

2. 2

   If x + y = 10 and x − y = 2, what's a good guess for x?

3. 3

   Let's solve x + y = 10 and x − y = 2 together.

4. 4

   Use the number line to find x when x + y = 8 and x − y = 2.

5. 5

   For x + y = 8 and x − y = 2, what is y?

6. 6

   Try this: 2x + y = 12 and x − y = 3.

7. 7

   What is x when 2x + y = 12 and x − y = 3?