# Two variable inequality

## Two variable inequalities from their graphs

Therefore, 3,4 is a solution to the system. So if you give us any x-- and let me label the axes here. Points on the plane are designated by ordered pairs of numbers written in parentheses with a comma between them, such as 5,7. In this table we let y take on the values 2, 3, and 6. In later algebra courses, methods of recognizing inconsistent and dependent equations will be learned. Therefore, the system has as its solution set the region of the plane that is in the solution set of both inequalities. Check these values also. Some dimensions may not be practical, but they must be accepted. Shade this region using a different color using the program 4. So 3 times x plus 5. The two lines intersect at the point 3,4. Example 2 Solve by addition: Note that in this system no variable has a coefficient of one. Step 2 Check one point that is obviously in a particular half-plane of that line to see if it is in the solution set of the inequality. That's the y-intercept.

In this case, solving by substitution is not the best method, but we will do it that way just to show it can be done. We thus refer to the third point as a "checkpoint.

This fact will be used here even though it will be much later in mathematics before you can prove this statement. Not all pairs of equations will give a unique solution, as in this example. Many students forget to multiply the right side of the equation by The resulting point is also on the line. Notice that once we have chosen a value for x, the value for y is determined by using the equation. You take the x, go up to that line and everything below it. Now study the following graphs. Y has to be less than 8. This is one of the points on the line.

Do this before going on. We will readjust the table of values and use the points that gave integers.

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