Posted by Angie on Monday, April 13, 2009 at 5:30pm.
If I were to graph 20a+34b is greater than or equal to 240, which would be the easier way: graphing it by finding the x and y intercepts, or graphing it by finding the slope and yintercept?

Math  Reiny, Monday, April 13, 2009 at 6:26pm
since you are talking about x and y intercepts you should look at your relation as
20x + 34y ≥ 240 rather than using a and b
I usually use the x and y intercepts, since in most cases you can do them in your head.
e.g. if y = 0, x = 12
if x = 0, y = appr. 7 (actually 7.06)
so you quickly have two points that determine your line.
If the equation is in the form
y = mx + b, I mark the yintercept, then step off to the next point by using the slope.
e.g. y = (3/4)x + 1
mark (0,2), from that point move to the right 4, then up 3 and you got your two points for the line. Real easy.

Math  Angie, Monday, April 13, 2009 at 6:29pm
thanks
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