Please be clear graphic solution

Let's denote x1 by x and x2 by y.
The solution to the maximization problem is as shown below:

So,
zmax = 31
x1op = 13
x2op = 5
Hope this helps !
Please be clear graphic solution Question (4): Use the graphical solution to solve the following LP...
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Use the Big M method to find the optimal solution to the following LP: max z = x1 + x2 s.t. 2x1 + x2 > 3 3x1 + x2 = 3.5 x1 + x2 = 1 X1, X2 = 0
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