<PRE><B>Question 99254</B>
Find the slope of the line through the following pairs of points. 
(-5, -3) and (-5, 2)
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slope = change in y / change in x = (2--3)/(-5--5) = 5/0 = undefined
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Find the constant of variation k.
m varies directly with n; m = 144 when n = 8.
m = kn
144 = k*8
k = 144/8 = 18
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The revenue for a sandwich shop is directly proportional
to its advertising budget. When the owner spent $2000 a month on advertising, the revenue was $120,000. If the revenue is now $180,000, how much is the owner
spending on advertising? 
x/180,000 = 2000/120000
x = 180000(1/60) = $3000 (amount owner is spending on advertising)
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Cheers,
Stan H.
</PRE>