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According to the three-step method for checking whether a number is a solution to an equation, what is the second step?
ASubstitute the given number in for the variable
BSimplify the expressions on both sides of the equation
CDetermine whether the resulting equation is true
DGraph both sides of the equation carefully
Answer & Solution
Correct answer: B. Simplify the expressions on both sides of the equation
1. Step 1 substitutes the candidate number in for the variable in the equation.
2. Step 2 then simplifies the expressions on both sides of the resulting equation.
3. Step 3 checks whether the simplified equation is true, which comes only after the simplifying step, and graphing is not part of this method at all.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 2 "Solving Linear Equations and Inequalities", section 2.1 Solve Equations Using the Subtraction and Addition Properties of Equality_
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