Math  /  Geometry

Question{xy>3x6\left\{ \begin{array}{l} x - y > 3 \\ x \geq 6 \end{array} \right. Graph system of inequalities to show all possible solutions.

Studdy Solution

STEP 1

What is this asking? We need to draw a picture that shows all the possible xx and yy values that make both xy>3x - y > 3 and x6x \geq 6 true! Watch out! Remember to check if the line itself is included in the solution by checking if the inequality includes the "equals" part (like \geq or \leq).
Also, don't mix up which side to shade!

STEP 2

1. Graph the first inequality
2. Graph the second inequality
3. Find the overlapping region

STEP 3

Let's **rewrite** our first inequality, xy>3x - y > 3, to make it easier to graph.
We want to get yy by itself.
We can add yy to both sides to get x>3+yx > 3 + y.
Then, subtract 3 from both sides to get x3>yx - 3 > y, or y<x3y < x - 3.

STEP 4

Now, we **graph** the line y=x3y = x - 3.
This line has a **slope** of 11 and a **y-intercept** of 3-3.
Since our inequality is y<x3y < x - 3 and *not* yx3y \leq x - 3, the line itself is *not* included in the solution.
We represent this by drawing a **dashed line**.

STEP 5

To figure out which side of the line to shade, we can pick a **test point** that's *not* on the line, like (0,0)(0, 0).
Plugging that into our inequality y<x3y < x - 3, we get 0<030 < 0 - 3, or 0<30 < -3.
This is *false*!
So, we shade the side of the line that *doesn't* include (0,0)(0, 0).

STEP 6

Our second inequality is x6x \geq 6.
We **graph** the line x=6x = 6.
This is a **vertical line** passing through x=6x = 6.
Since the inequality is \geq, the line *is* included in the solution.
We draw a **solid line** to show this.

STEP 7

Since we want xx values *greater than or equal to* 6, we shade the region to the *right* of the line x=6x = 6.

STEP 8

The solution to the system of inequalities is the region where the shading from both inequalities *overlaps*.
This is the region that satisfies *both* inequalities at the same time!

STEP 9

The solution is the region shaded by *both* y<x3y < x - 3 (below the dashed line) and x6x \geq 6 (to the right of the solid line).
It looks like a wedge pointing up and to the right, starting at the point (6,3)(6,3) but not including that point itself, since the line y=x3y = x - 3 is dashed.

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