How do you graph x+y=3?

May 3, 2016

Plot two solution points and draw a line through those points.

Explanation:

Since $x + y = 3$ is a linear equation
we only need two points to plot the equation's line.

Two obvious points to use would be the x and y intercepts:
$\textcolor{w h i t e}{\text{XXX}} \left(0 , 3\right)$ and $\left(3 , 0\right)$

Plotting these two points and drawing a line through them should give a graph like:
graph{((x-3)^2+y^2-0.01)(x^2+(y-3)^2-0.01)(x+y-3)=0 [-6.323, 9.48, -2.71, 5.19]}