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A factory produces two types of machines A and B. Both A and B make use of two essential components, a nut and a bolt. Each unit A requires 3 nuts and 2 bolts and each unit of B requires 2 nuts and 4 bolts, The total supply of components per month is restricted to 210 nuts and 300 bolts. Type B also requires a shaft whose supply is restricted to 60 units per month. Formulate this as system of inequalities if number of machines A and B are x and y, respectively.