Posted by Diane on Saturday, July 30, 2011 at 6:45am.
25p + 20s = 300
Easiest way to find ordered pairs is to look at the intercepts.
Here they would be (0,15) and (12,0)
the slope of the line is -25/20 = -5/4
that is, for every decrease of 5 the 'ss, there will be an increase of 4 in the p's
so take any point, decrease the s by 5, increase the p by 4
from (0,15) --> (4,10) --> (8,5) --> (12,0)
Your graph should confirm that.
The above 4 points are the only ones containing positive integers, fractions or negatives would not make any physical sense.
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