can anyone answer the question on the pic.....

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- Oct 17th 2009, 05:43 PMSneakyslope question - finding when a line is tangent to a curve
can anyone answer the question on the pic.....

- Oct 17th 2009, 05:57 PMmr fantastic
Solve the following two equations simultaneously for $\displaystyle c$:

$\displaystyle \frac{c}{2 \sqrt{x}} = \frac{1}{2}$ .... (1)

$\displaystyle c \sqrt{x} = \frac{1}{2} x + \frac{9}{2}$ .... (2)

(Your other job, apart from solving these two equations, is to think about where they have come from).