| Exam Board | OCR |
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| Module | C4 (Core Mathematics 4) |
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| Year | 2007 |
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| Session | June |
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| Topic | Implicit equations and differentiation |
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6 The equation of a curve is \(x ^ { 2 } + 3 x y + 4 y ^ { 2 } = 58\). Find the equation of the normal at the point \(( 2,3 )\) on the curve, giving your answer in the form \(a x + b y + c = 0\), where \(a , b\) and \(c\) are integers.