GMATPREP - PS problem -3

Vishal please check the attachment.I have tried to explain but dont know how much i am correct.
Hope it helps you.

You can see this most easily by simply drawing the circle and then the lines that would fit the clues given.

1. The equation of the unit circle described is x^2 + y^2 = 1 - draw this.

Clue a.
2. Draw a line that crosses the x axis at 1/2. No matter what slope, it must intercept the circle.
3. Draw a line that crosses the x axis at 20 and is perpendicular to the x axis. It will never intercept the circle.

Clue B.

4. Looking at the same two drawings above, if the x-intercept is 1/2 you intersect the circle no matter what the slope so you can have a slope of - 1/10 and intersect the circle.
5. Looking at the second drawing, with an x intercept of 20, your equation becomes 0 = (-1/10)*(20) + b.
the y intercept is then +2 and the line passes above the circle.

Looking at the two together, as in steps 4 and 5 you still get both a yes and a no. The information is insufficient.

i am confused with clue B.

Can anyone elaborate .

Clue b is simply the slope of hte line. Draw a line with a -1/10 slope and then draw several lines parallel to it. You will see that some of them will intersect your circle and some will not.