exam Maths Puzzle Numerical Ability

im just a middle schooler getting ready to take the act test i dont know what to do i know nothing about algerbra

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3. Plot the graph of the above equations formed in question 2, and post your response to the discussion forum. Can someone please help me understand this problem?
Given the constraints x + y(<=)90, 3x - y(>=)0, x(>=)0, y(>=)0, the minimum value for the function f(x) = 10x + 11y is
a. -90
b. 0
c. -3
d. 990
Thank you