Math topics

One- and two-step equations

Two-step equations need two inverse moves — often undo addition/subtraction first, then undo multiplication/division (or follow the structure of the equation). Always substitute your answer back to check.

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Worked example

Problem. Solve for x: 2x + 3 = 11

1. Subtract 3 from both sides: 2x = 8.
2. Divide both sides by 2: x = 4.
3. Check: 2(4) + 3 = 8 + 3 = 11.

Answer. 4

Practice set

1. Practice 1. Solve: 3x − 1 = 8

   Show answer

   3

2. Practice 2. Solve: x/2 + 1 = 5

   Show answer

   8

3. Practice 3. Solve: 5x = 20

   Show answer

   4

Related pages

• Basic algebra
• expressions
• Math for grades 6–8

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