Posted by Elisa on Sunday, September 27, 2009 at 4:51am.
You're close.
I get
y=(1/8)x-50/8, or y=(1/8)x - 25/4
you probably had the sign reversed.
To plot the graph, you already have one point: the y-intercept, i.e. (0, -25/4).
You can get the x-intercept by substituting y=0, and solving for x.
0=(1/8)x-25/4.
In theory, two points are sufficient to plat a straight line. However, I suggest you take a third point, for example, x=20, to confirm that all three points lie on a straight line and avoid arithmetical errors.
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