Given an equation of the form x + p = q or x - p = q with a unique nonnegative rational solution, solve for x using an inverse operation and verify the result by substitution.
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What you’ll learn
Given an equation of the form x + p = q or x - p = q with a unique nonnegative rational solution, solve for x using an inverse operation and verify the result by substitution.
Key idea
An equation stays equivalent when the same number is subtracted from both sides.
Worked example
Solve for x and check your answer.
x + 7 = 15
x = 15 - 7
x = 8
Answer: 8
Quick Check
Analyze the proposed student response. Choose Correct or Incorrect.