Posted by **AMY** on Friday, November 12, 2010 at 5:39pm.

Hello! quick question.

why the line y = -3 is a horizontal line.

describe how this line sits on the Cartesian (coordinate) plane.

I have tried a few thoughts on this. Firstly the horizontal sits on the y intercept. The graph y = b is a horizontal line. -3 is to the left of the origin which is 0. It follows the order of a number line. Negative numbers to the left and positive numbers to the right. This is all I have so far. Did I get close??

Your help is appreciated!!

- Linear Equation question -
**Henry**, Friday, November 12, 2010 at 9:21pm
If you followed a line that has a slant or slope, you'll notice that the

x and y co-ordinate are both changing.

If you followed a vertical line,only the y co-ordinate will change.If you

followed a horizontal line, the x co-

ordinate only will change. The y co-

ordinate will be constant(y = c). Therefore, when x is constant,its' a

vertical line; and when y is constant,

its' a horizontal line.

In your case, y = c = -3, and its' a hor. line. Since y is constant, it re-

mains the same no matter what value

you assign to x.

Use the following points to graph the

Eq.: y = -3.

(-4 , -3) , (-2 , -3) , (0 , -3),

(2 , -3).

I hope this will help.

- Linear Equation question -
**AMY**, Saturday, November 13, 2010 at 6:19am
Thank you Henry

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