Algebra 2 Lesson 2.8: Linear-Quadratic Systems

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We cover how to solve linear-quadratic systems by graphing as well as algebraically using the substitution method
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32:03
-3 + 9 = -6? Shouldn't it be positive 6? If it is positive 6, the solution should be x = 1 and not -1.
Just wanted to ask. Thank you.

oldmegone