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D1 linear programming help!

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I understand and was capable of doing most of this question except the last two parts. The mark scheme says the max line is y+1.5x and I just don't understand where this comes from at all!
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maximize objective function x + y + z (number of pillows). double number of soft pillows as hard pillows so z = 0.5x. So maximize y + 1.5x

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