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In the six-step method for solving a system of equations by substitution, what is the first step?
ASubstitute the expression into the other equation
BSolve one of the equations for either variable
CWrite the solution as an ordered pair
DCheck the solution in both original equations
Answer & Solution
Correct answer: B. Solve one of the equations for either variable
1. The method begins by solving one of the two equations for either x or y.
2. Only after that expression is found does the method substitute it into the other equation.
3. Writing the final ordered pair and checking it come at the very end, well after the equation is solved and substituted.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 5 "Systems of Linear Equations", section 5.2 Solve Systems of Equations by Substitution_
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