Question

Plans for a bridge are drawn on a coordinate grid. One girder of the bridge lies on the line y = -9x - 9. A perpendicular brace passes through the point (-1, 7). Write an equation of the line that contains the brace.

y - 1 = - 1/9 (x + 7)
x - 7 = -9(y + 1)
y - 7 = 1/9(x + 1)
y - 7 = -9(x + 1)

Answer 1

@surjithayer

Answer 2

@amistre64

Answer 3

Do you know what slope is?

Answer 4

Not really.

Answer 5

I know the slope formula, but that's it.

Answer 6

can you tell me what is the slope of the given line?

Answer 7

y = -9x - 9?

Answer 8

yea slope of that line!

Answer 9

\[\frac{ -9 }{ 9 }\]

Answer 10

No.. how did you get that!? :-/

Answer 11

I'm pretty bad at Geometry.

Answer 12

hmmp

the standard equation for a line is
\[y = mx+c\]
where m is the slope
and c is the y intercept
m = delta y/ delta x
that is the meaning of slop.. how slanted it is