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Course: Algebra (all content) > Unit 1
Lesson 1: Overview and history of algebraIntro to the coordinate plane
Google ClassroomDescartes created a system of two perpendicular axes (the x and y axes) which could be used to plot points in a plane. This enabled the visualization of algebraic equations in geometric form. For example, a linear equation like y = 2x + 1 could be plotted as a line on the coordinate plane, while a quadratic equation like y = x^2 could be plotted as a parabola. This linked algebra and geometry through the use of graphs. Created by Sal Khan.
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