How do you graph the inequality 3x-y<=6 ?

1 Answer
May 26, 2017

See the explanation.

Explanation:

Graph:

3x-y>=6

Change the equation to the slope intercept form by solving for y.

Subtract 3x from both sides.

color(red)cancel(color(black)(3x))-color(red)cancel(color(black)(3x))-y>=6-3x

Simplify.

-y>=-3x+6

Multiply both sides by -1. This will change the direction of the inequality.

y<=3x-6

Determine some points on the line by picking values for x and solving for y.

Points
x=-2,y=-12
x=0,y=-6
x=2,y=0

Plot the points, and draw a straight solid line through them. Then shade the area below the line.

Graph graph{y<=3x-6 [-15.7, 16.32, -13.07, 2.95]}