If a 750 ml bottle of juice costs £1.90 and a 1 litre bottle of the same juice costs £2.50 then the 750 ml bottle is better valu
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The tangent line to the curve has slope equal to at the point (2, -1). We have, by implicit differentiation,
At the point (2, -1), the slope is then 2/9, so the tangent line has equation