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March 29, 2015

March 29, 2015

Posted by **Jack** on Wednesday, January 9, 2008 at 6:43pm.

- Algebra -
**Damon**, Wednesday, January 9, 2008 at 6:58pmy = m x + b will graph as a straight line. Try graphing it to see what m and b mean.

First make a mark at x = 0 and y = b. That is point (0,b) and is called the y axis intercept. That is what the b means.

Now from that point go right one unit in x and up m units in y.

That is another point on the line (1, b+m)

That is what slope, m , means. When you go right one, you go up m.

Two points determine the line, so take a ruler and draw that line through the two points. That is your graph of the equation y = m x + b.

Of course You can see right away that (0,b) lies on the line because when x = 0

y = 0 + b

but that second point has to be shown.

(1, b+m)

put it in the equation

y = m x + b

b + m = m (1) + b ? sure enough

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