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Find the graph of the solution set of the following system of linear inequalities. Drag the points into the correct positions to determine the lines and then drag the shading points to select the correct shading. \[ \begin{array}{r}-x+2 y>-2 \\ 2 x+y>-3\end{array} \]

Ask by Mullins Fowler. in the United States
Mar 10,2025

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Answer

To graph the solution set of the system of inequalities: 1. **First Inequality:** \[ -x + 2y > -2 \] - Rewrite as: \[ y > \frac{1}{2}x - 1 \] - Draw the dashed line \( y = \frac{1}{2}x - 1 \) and shade above it. 2. **Second Inequality:** \[ 2x + y > -3 \] - Rewrite as: \[ y > -3 - 2x \] - Draw the dashed line \( y = -3 - 2x \) and shade above it. 3. **Intersection Point:** - Solve the system to find the intersection point: \[ \left(-\frac{4}{5}, -\frac{7}{5}\right) \] 4. **Final Graph:** - Shade the region above both dashed lines, which satisfies both inequalities. This shaded area represents all points \((x, y)\) that satisfy both \( -x + 2y > -2 \) and \( 2x + y > -3 \).

Solution

1. Start with the two inequalities: \[ -x+2y > -2 \quad \text{and} \quad 2x+y > -3. \] 2. Rewrite the first inequality by isolating \( y \). Add \( x \) to both sides: \[ 2y > x - 2. \] Then divide by 2: \[ y > \frac{1}{2}x - 1. \] The line corresponding to the equality is \[ y = \frac{1}{2}x - 1. \] Since the inequality is strict (\( > \)), the boundary line is dashed and the solution is the set of points \emph{above} this line. 3. Rewrite the second inequality by isolating \( y \). Subtract \( 2x \) from both sides: \[ y > -3 - 2x. \] The corresponding boundary line is \[ y = -3 - 2x, \] again drawn as a dashed line since the inequality is strict. The solution region is the set of points \emph{above} this line. 4. Find the intersection of the two boundary lines by solving: \[ \frac{1}{2}x - 1 = -3 - 2x. \] Multiply both sides by 2 to eliminate the fraction: \[ x - 2 = -6 - 4x. \] Add \( 4x \) to both sides: \[ 5x - 2 = -6. \] Now add 2 to both sides: \[ 5x = -4, \] so \[ x = -\frac{4}{5}. \] Substitute \( x = -\frac{4}{5} \) back into one of the line equations (using \( y = \frac{1}{2}x - 1 \)): \[ y = \frac{1}{2}\left(-\frac{4}{5}\right) - 1 = -\frac{2}{5} - 1 = -\frac{7}{5}. \] Thus, the lines intersect at \[ \left(-\frac{4}{5}, -\frac{7}{5}\right). \] 5. The final graph is constructed as follows: - Draw the line \( y = \frac{1}{2}x - 1 \) as a dashed line. - Draw the line \( y = -3 - 2x \) as a dashed line. - Shade the region that is above both of these lines. This is the intersection of the half-planes: \[ y > \frac{1}{2}x - 1 \quad \text{and} \quad y > -3 - 2x. \] Any point in the shaded region satisfies both \( -x+2y > -2 \) and \( 2x+y > -3 \).

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The Deep Dive

To graph the solution set for the inequalities, start by rewriting them in slope-intercept form: 1. From the inequality \(-x + 2y > -2\), add \(x\) to both sides and rearrange: \[ 2y > x - 2 \implies y > \frac{1}{2}x - 1 \] The boundary line is \(y = \frac{1}{2}x - 1\), which has a slope of \(\frac{1}{2}\) and a y-intercept at \(-1\). Since it’s a “greater than” inequality, we will use a dashed line and shade above it. 2. For the second inequality \(2x + y > -3\), rearrange it: \[ y > -2x - 3 \] The boundary line is \(y = -2x - 3\), with a slope of \(-2\) and a y-intercept at \(-3\). It’s also a “greater than” inequality, so we use a dashed line and shade above this line as well. To find the solution set, look for the region where the shaded areas of both inequalities overlap. It will be above both lines. Make sure to accurately place the lines on the graph according to their slopes and intercepts!

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