21.5.3 Where Two Lines Cross and the System of Equations
21.5 Linear Functions Tie Together Equations and Inequalities
Point 3 of 5
21.5.3 Where Two Lines Cross and the System of Equations
Core idea
The point where two lines cross satisfies both equations at once, so the crossing's coordinates are the system's shared solution.
Module goal. Use the lens of the straight line to unify linear equations and inequalities, turning algebraic solving into "reading heights off the graph."
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