21.5.1 The Line's Crossing of the x-Axis Is the Equation's Solution
21.5 Linear Functions Tie Together Equations and Inequalities
Point 1 of 5
21.5.1 The Line's Crossing of the x-Axis Is the Equation's Solution
Core idea
The instant the line touches the x-axis, y=0, and the x there is exactly the solution of the equation kx+b=0.
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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