Use graphical methods to solve each linear programming problem.
Find values of x ≥ 0 and y ≥ 0 that minimize z = 3x + 2y subject to each set of constraints.
(a) 10x + 7y ≤ 42
4x + 10y ≥ 35
(b) 6X + 5y ≥ 25
2x + 6y ≥ 15
(c) x + 2y ≥ 10
2x + y ≥ 12
x – y ≤ 8
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