The second constraint is the same as the objective function, so your problem boils down to finding integer solutions to
.. 3x1 +5x2 = 36
There are 3 solutions. They are (x1, x2) = (12, 0), (7, 3), (2, 6)
The value of the objective function there is (obviously) 36.
A translation
(I'm assuming that this isn't multiple choice since you didn't include the answer choices.)
Answer:
3
Step-by-step explanation:
Formula:

= 3
The answer should be 14.
You just have to substitute x with the given number and finish the equation.