14.2 Algebraic Solution of Systems of Equations
Solution by Substitution • Solution by Addition or Subtraction
Often, the graphical method is the easiest way to solve a system of equations. With a graphing calculator, it is possible to find the result with good accuracy. However, the graphical method does not usually give the exact answer. Using algebraic methods to find exact solutions for some systems of equations is either not possible or quite involved. There are systems, however, for which there are relatively simple algebraic solutions. In this section, we consider two useful methods, both of which we discussed before when we were studying systems of linear equations.
SOLUTION BY SUBSTITUTION
The first method is substitution. If we ...
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