A dietitian wishes to mix together 2 kinds of food so that the vitamin content of the mixture is at least 9 units of vitamin A , 7 units of vitamin B, 10 units of vitamin C and 12 units of vitamin D . The vitamin content per kg of each food is shown below:
A. B. C. D
food I. 2. 1. 1. 2
food II. 1. 1. 2. 3
ASSUMING X UNITS OF FOOD I AND Y UNITS OF FOOD II THE SITUATION CAN BE EXPRESSED AS -
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