Posted by KerryAnn on Saturday, February 9, 2013 at 9:26am.
1. Given that the straight line y=c3x does not intersect the curve xy=3, find the range of values for c.
2. Find the range of values for c for which the line y=cx+6 does not meet the curve 2x^2xy=3.
3. Find the range of values for k for which 8y=x+2k is a tangent to the curve 2y^2=x+k

Pure Mathematics  bobpursley, Saturday, February 9, 2013 at 9:53am
The slope of line cannot be that of curve or greater.
slope line=3
slope curve>slope line
3<3/x^2
x^2>1
x>1
check x=10 slope line=3
slope curve=3/100=.03
check x=1/2 slope curve=12
do the others the same way

Pure Mathematics  KerryAnn, Saturday, February 9, 2013 at 10:02am
number one is supposed to be 6<c<6
number two is supposed to be c>5
and number three is supposed to be k=8

Pure Mathematics  Steve, Saturday, February 9, 2013 at 2:38pm
the slope of xy=3 is y' = 3/x^2
So, the slope is 3 at x=1
The tangent to the curve at x=1 is
y3 = 3(x1)
y = 3x+6
y = 63x
so, for y = c3x, if c < 6, the line falls below the curve. Similarly, for x<0, the line lies above the other branch of the curve if c > 6.
So, 6 < c < 6
Follow this logic for the other parts
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