How do you graph 3x+y=15?

1 Answer
Feb 9, 2017

Find two pair of sample solution points (the intercepts are often convenient);
Plot the two points;
Draw a straight line through the points.
color(white)("XXX")(see below)

Explanation:

Given 3x+y=15

If x=0
then y=15

If y=0
then x=5

So we have two sample points (0,15) and (5,0)

Since 3x+y=15 is a linear equation, we only need two points to establish the graph.

Plotting these points and drawing a line through them gives us a graph that should look like:
enter image source here