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December 18, 2014

December 18, 2014

Posted by **Susana** on Monday, October 3, 2011 at 12:57pm.

Line: y=x+4

- Calculus -
**Reiny**, Monday, October 3, 2011 at 2:35pmI will assume your equation is

f(x) = k√x = k x^(1/2)

then f'(x) = (k/2)x^(-1/2)

but the slope of y = x+4 is 1

so (k/2)x^(-1/2) = 1

k/(2√x) = 1

k = 2√x

then y = 2√x √x = 2x

sub back into y = x+4

2x = x+4

x = 4

so k= 2√4 = 4

- Calculus -
**Anonymous**, Sunday, January 13, 2013 at 6:07amy=2x√ 2-x

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