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I am struggling with minimization(maximization) problems which needs to be solved graphically but they have unknown parameter in objective function:

For example:

f = 2x_1 + \lambda x_2(min)

for conditions:

-x_1 + x_2 \leq 3

x_1 + 2x_2 \leq 12

3x_1 -x_2 \leq 15

x_i \geq 0

More than solution I need to understand the way so I can proceed for similar examples

Regards

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# LP objective function with unknown parameters

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