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Two-Step Equations: Practice & Homework Checker

Stop guessing on your math homework. Solving equations is just a game of 'undoing' what happened to xx. If you follow the order and keep the scale balanced, you'll get the right answer every time.

1. The "SADMEP" Rule #

To isolate the variable, you use the Order of Operations (PEMDAS) in reverse. This is often called SADMEP:

  • 1.
    Subtraction & Addition (Undo these first)
  • 2.
    Division & Multiplication (Undo these second)
  • 3.
    Exponents & Parentheses

    • 2. Worked Example #

    Solve for xx:

    3x−4=113x - 4 = 11

    • Step 1 (Undo Subtraction): Add 44 to both sides. 3x=153x = 15
    • Step 2 (Undo Multiplication): Divide both sides by 33. x=5x = 5
    Info

    Pro Tip: Always plug your answer back in. 3(5)−4=113(5) - 4 = 11. If the math checks out, you're done.

    3. Practice Drill #

    Test yourself on this one before you use the tool below.

    Solve for xx:

    2x+6=202x + 6 = 20

    Single choice

    4. The Homework Savior #

    Use this tool to check your final answers for any standard equation in the format ax+b=cax + b = c.

    Note: If your equation is 4x−5=154x - 5 = 15, your "b" value is -5.

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    The value of x is:
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    Created by
  • A
    anya.equationsAnya
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