$ f(x)=2x+1 $, the Y-intercept is to calculate $ f(0)=1 $ which is the height of the function at cero. The slope is the coefficient that multiply x, which in this case is 2. A third point could be evaluate at $ x=1 $ to obtain $ f(1)=3 $. So you have two positions in the cartesian plane: $ (0,1) $ and $ (1,3) $, which determine an unique line of slope 2.
|This article is a stub. You can help Math Wiki by expanding it.|
Community content is available under CC-BY-SA unless otherwise noted.