This video presents the method of graphing lines with slope and y-intercept. Aligned to Common Core State Standards: 7.RP.2 , 8.EE.6
Use similar triangles to explain why the slope ? is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation ? = ?? for a line through the origin and the equation ? = ?? + ? for a line intercepting the vertical axis at ?.