Step 1 :Rearrange the inequality \(x + 4y \leq 12\) to the form \(y \leq -\frac{1}{4}x + 3\). This is a line with a slope of -1/4 and a y-intercept of 3. The inequality \(y \leq -\frac{1}{4}x + 3\) means that the feasible region is below the line.
Step 2 :Rearrange the inequality \(3x + 4y \geq 12\) to the form \(y \geq -\frac{3}{4}x + 3\). This is a line with a slope of -3/4 and a y-intercept of 3. The inequality \(y \geq -\frac{3}{4}x + 3\) means that the feasible region is above the line.
Step 3 :The feasible region for the system of inequalities is the region that is both below the line \(y = -\frac{1}{4}x + 3\) and above the line \(y = -\frac{3}{4}x + 3\). This region is a triangle with vertices at the points where the lines intersect the x-axis and y-axis.
Step 4 :To find these intersection points, set \(y = 0\) in both equations and solve for \(x\), and set \(x = 0\) in both equations and solve for \(y\).
Step 5 :For \(x + 4y = 12\), when \(y = 0\), \(x = 12\). When \(x = 0\), \(y = 3\).
Step 6 :For \(3x + 4y = 12\), when \(y = 0\), \(x = 4\). When \(x = 0\), \(y = 3\).
Step 7 :So, the vertices of the feasible region are at the points (12, 0), (4, 0), and (0, 3).