Math Problem Statement

Solve the system of two linear inequalities graphically: y ≤ 7x + 7 and y > 3x + 3.

Solution

The system of two linear inequalities shown in the image is:

y7x+7andy>3x+3y \leq 7x + 7 \quad \text{and} \quad y > 3x + 3

Let's break this down into the steps as suggested in the question:

Step 1: Graph the first inequality y7x+7y \leq 7x + 7.

  1. Find the boundary line for y=7x+7y = 7x + 7. This line is straight, and its slope is 7 with a y-intercept of 7. To graph the line:

    • Start by plotting the point (0, 7) since the y-intercept is 7.
    • Use the slope 77 to find another point. The slope means rise over run (rise = 7, run = 1), so from (0, 7), move 1 unit to the right and 7 units up to get the point (1, 14).
  2. Determine the boundary type:

    • Since the inequality is \leq (less than or equal), the boundary line should be solid because it includes the points on the line.
  3. Shade the region:

    • You will shade the region below the line y=7x+7y = 7x + 7 because the inequality is y7x+7y \leq 7x + 7 (less than or equal means below the line).

Now, you can enter two points on the graph corresponding to the line (e.g., (0, 7) and (1, 14)) and choose a solid line. Finally, shade the appropriate region (below the line).

Once you finish this step, you'll proceed to graph the second inequality y>3x+3y > 3x + 3 in a similar way.

Would you like further details on the second inequality and overall solution? Let me know if you have any questions.

Here are some follow-up questions to help deepen your understanding:

  1. What happens if the inequality symbol is switched to \geq or \leq?
  2. How do you graph inequalities with negative slopes?
  3. What if the system involves xx-related inequalities like x5x \geq 5?
  4. Can two inequalities have overlapping shaded regions, and what does that represent?
  5. How do you handle inequalities involving absolute values?

Tip: Always check whether the inequality involves a strict inequality ( >> or <<) or an inclusive one ( \geq or \leq), as this affects the type of boundary line!

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Math Problem Analysis

Mathematical Concepts

Linear Inequalities
Graphing Inequalities
Slope-Intercept Form

Formulas

y = mx + b, where m is the slope and b is the y-intercept

Theorems

Concept of Graphing Inequalities

Suitable Grade Level

Grades 8-10