Posted by **roy** on Monday, March 21, 2011 at 11:26pm.

if you know that AB=0 and A not=to B, what can you say about the equation Ax+By=1? Describe the graph.

- 8th grade math -
**Reiny**, Tuesday, March 22, 2011 at 7:58am
if in Ax + By = 1, AB = 0

then either A =0 or B=0

If A=0, then you have the horizontal line y = 1/B

if B=0, then you have the vertical line x = 1/A

- 8th grade math -
**hfgh**, Tuesday, March 22, 2011 at 2:20pm
The line above goes through points (-4,-5) and (0,3). What point will the line above go through when y is equal to 8?

- 8th grade math -
**Ummmmm....**, Wednesday, October 24, 2012 at 8:57pm
You can just look in the back of the textbook, but here is what it says:

The equation will be either

Ax = 1 or By = 1; the graph will be either a vertical or horizontal line.

- 8th grade math -
**Ummmmm....**, Wednesday, October 24, 2012 at 9:03pm
Here is what I personally wrote:

Either A or B must equal 0, so the equation Ax+By+1 in standard form would either be Ax=1 or By=1. The graph would either be a vertical line or a horizontal line.

- 8th grade math -
**Ummmmm....**, Wednesday, October 24, 2012 at 9:04pm
OOPS. Sorry I accidentally posted the same thing twice. :D

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