The feasible region for an LPP is shown in the given figure.
The maximum value of the objective function $z=3x+4y$ is :
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 100
Coordinator of B = ?
Equation of line ⇒ y = Slope (x) + c
Slope of line = $\frac{y_2-y_1}{x_2-x_1}$
Slope of line $AD=\frac{0-50}{25-0}=-2$
Slope of line $BC=\frac{0-20}{40-0}=-\frac{1}{2}$
Equation of line AD ⇒ $y=-2x+c$
$y=-2x+50$ ...(1)
Equation of line BC ⇒ $y=-\frac{1}{2}x+c$
$20=-\frac{1}{2}(0)+c$
$20=c$
$∴y=-\frac{1}{2}x+20$ ...(2)
From (1) and (2)
$y=-2x+50$
$y=-\frac{1}{2}x+20$
$0=-\frac{3}{2}x+30$
$0=-3x+60$
$x=20$
$y=-2(20)+50$
$=10$
∴ Coordinator of B ⇒ (20, 0)
| Critical Points | Value of Z |
| (25, 0) | 75 |
| (0, 20) | 80 |
| (0, 0) | 0 |
| (20, 0) | 100 |
∴ Maximum value = 100