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klio [65]
3 years ago
11

The value of y varies directly with x, and y=28 when x=7. Find y when x=4 by first finding k.

Mathematics
1 answer:
lesya692 [45]3 years ago
7 0
Direct proportionality is the type of proportionality where an increase in one quantity or variable causes a corresponding increase in another quantity. 
Therefore; y varies directly as x
Hence; y α x
             y =k x where k is a constant 
if y= 28 and x = 7 , then k = 28/4 =4
hence, y = 4 k
when x = 4, then y= 16

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