Plotting a graph:
This solver uses formula rendering system and here's the actual formula that was plotted:
graph( 600, 400, -15, 15, -10, 15, (-2/3)x+2 )
Recall that when a line is drawn in a plane, the line divides the plane into three sets of points:
and the .
Now, consider the solution to ..
Recall that the solution is of these along with the.
Note that would result in the same half-plane;.
One method for the is to "" the with the coordinates of a point that is on the line.
If the coordinates the inequality, then in that are solutions.
We then .
Usually the point =(,) is the simplest -provided the line through the.
In this example, the (,) satisfies the inequality and gives us the solution:
On graph above, shade the and the which lies on the left from the line.