Respuesta :

8x + 4y + 6 <= 70

x = # of salads 
y = # of drinks

If he buys 4 salads then

8x + 4y + 6 <= 70
8(4) + 4y + 6 <70
32 + 4y + 6 <= 70
4y + 38 <= 70
4y <= 32
  y <= 8

Answer
A. 8


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