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Anonymous
16x2+56xy+49y2
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If you mean: 2x+7y = -1 and 4x-3y = -19 then by substitution x = -4 and y = 1
4x + 3y - 2x - 7y2x - 4y
The derivative of 2x2 + 4x + 8 is 4x+4.
x = -½
x - 2