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Purdue MA 11100 - Lecture notes
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Lesson 18 Section 3.2Substitution Method:1. Solve one of the equations for either x or y. (Or select an equation that is already solved for x or y.)2. Substitute that quantity for the variable in the other equation.3. Solve and find the value of that variable.4. Substitute the value you found in any of the equations and solve for the remaining variable.5. Write your answer as an ordered pair.Examples:1)3392yxxy2)14162nmnm3)6224stst4)73522babaElimination Method:1. Write each equation in the form, CByAx ; where A, B, and C are not fractions or decimals.2. Multiply one or both equations, if necessary, so one pair of the variables are opposites. 3. Combine the equations together (add) and solve for the variable.4. Substitute that value in one of the equations and solve for the remaining variable.5. Write your answer as an ordered


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Purdue MA 11100 - Lecture notes

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