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-3x+4y doesn't have a maximum value because you can plug in anything for x and anything for y. In fact, if you keep x=0 and you plug in larger and larger numbers for y, you get a larger and larger output--it's unbounded.

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Q: What is the maximum value of -3x plus 4y?
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What the answer for this 3x plus 4y?

Oh, dude, you're hitting me with some math, huh? Well, technically, the answer for 3x + 4y is just 3x + 4y. I mean, you're not really simplifying it or anything, so that's all there is to it. Math can be a trip, man.


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