Write the equation of the line with x-intercept (–9, 0) and undefined slope.
A) y = –9
B) x = –9
C) y = –9x
D) x = 0
2007-09-07 16:55:41 · 6 answers · asked by ray 1 in Science & Mathematics ➔ Mathematics
The general equation of a Straight line is y = mx + c
where m = slope & c = y-intercept
now, the straight line is passing through the point ( -9 , 0 )[x-intercept]. So, if u put x = -9 & y=0 in the geral equation then u will get, (-9)m + c = 0.
Here y-intercept is ZERO [as it is x-intercept]
so, here c = 0
now, the equation is looks like (-9)m = 0 or, m = 0
so, this is basically a horizontal line parallel to y-axis
so, the required equation will be x = -9 [ans]
2007-09-07 17:34:32 · answer #1 · answered by sharbadeb 2 · 0⤊ 0⤋
A horizontal line has a slope of zero. This is because if you take y = mx + b and let m = 0, you get y = b which is just a horizontal line. A verical line has an "undefined" slope or "no slope". So the vertical line that passes through (-9,0) is simply x = -9.
2007-09-07 17:01:21 · answer #2 · answered by Anonymous · 0⤊ 0⤋
y = mx + c
when y = 0 x = - 9
0 = - 9m + c
c = 9m
y = m ( x + 9) where the slope m is undefined
None of A) to D) is correct
2007-09-07 17:15:59 · answer #3 · answered by vlee1225 6 · 0⤊ 0⤋
An undefined slope is a vertical line.
so x = -9
(none of the others are true at (-9,0)
2007-09-07 17:02:43 · answer #4 · answered by Beardo 7 · 0⤊ 0⤋
I think B) x = –9 not sure.
2007-09-07 16:59:31 · answer #5 · answered by Anonymous · 0⤊ 0⤋
c
2007-09-07 17:19:23 · answer #6 · answered by lol!!!Fanatic 2 · 0⤊ 0⤋