10: Systems of Equations — Read

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10.2: Solve Systems of Equations by Substitution
Solving systems of linear equations by graphing is a good way to visualize the types of solutions that may result. However, there are many cases where solving a system by graphing is inconvenient or imprecise. If the graphs extend beyond the small grid with x and y both between −10 and 10, graphing the lines may be cumbersome. And if the solutions to the system are not integers, it can be hard to read their values precisely from a graph.
10.3: Solve Systems of Equations by Elimination
We have solved systems of linear equations by graphing and by substitution. Graphing works well when the variable coefficients are small and the solution has integer values. Substitution works well when we can easily solve one equation for one of the variables and not have too many fractions in the resulting expression. The third method of solving systems of linear equations is called the Elimination Method.
10.4: Solve Mixture Applications with Systems of Equations
This page guides learners in solving mixture and interest application problems using systems of equations. It covers techniques with examples like ticket sales, coin values, and mixture calculations, such as trail mix and chemical solutions. The text emphasizes translating word problems into equations and features financial applications involving investments and loans, detailing specific scenarios for optimal allocations.

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