any line will intersect the x-axis at the point where its y-coordinate is = 0
so setting the equation below to 0 will give us the point where the line intersects the x-axis...
ax+c=0
x=-c/a
so the axis and the line will intersect at (-c/a, 0)
now we need to know the value of c/a...
neither of the answer choices help us evaluate the above so I ans should be E
39 geometry ds
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Brent@GMATPrepNow
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How does ax+by+c represent a line?ern5231 wrote:39) At what point do the lines ax+by+c and x axis intersect?
(1) a ≠0
(2) ab>0
Do you mean ax+by+c=0?
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Stuart@KaplanGMAT
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That was my question: ax+by+c doesn't represent a line on the xy plane, it's just an expression. Geometric shapes need to be in equation form in the coordinate plane.Brent Hanneson wrote:How does ax+by+c represent a line?ern5231 wrote:39) At what point do the lines ax+by+c and x axis intersect?
(1) a ≠0
(2) ab>0
Do you mean ax+by+c=0?
Stuart Kovinsky | Kaplan GMAT Faculty | Toronto
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