does one go about finding the slope of y=20-4*sqrt(x) when x=4 and y=11

From what I can tell y should = 12 when x =4

that aside, when I do the rate of change algebra f(x+h)-f(x)/h

I get

[-4(sqrt(x+h)-sqrt(x))]/h

am I on the wrong track?

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- Sep 21st 2012, 03:04 PMkingsolomonsgravesimple slope question that I can't make sense of
does one go about finding the slope of y=20-4*sqrt(x) when x=4 and y=11

From what I can tell y should = 12 when x =4

that aside, when I do the rate of change algebra f(x+h)-f(x)/h

I get

[-4(sqrt(x+h)-sqrt(x))]/h

am I on the wrong track? - Sep 21st 2012, 03:46 PMPlatoRe: simple slope question that I can't make sense of