Friday 4 December 2015

VARIATIONS 2


x is directly proportional to y. x=20 and y=2. Find x while y=13.

solution

x y
x = k y …….. (i)       [we put =k to replace the proportionality sign]

x=20, y=2, k=?
20 = k x 2        
20 =  2k        
1020 =    12k
  12           21        

k = 10.

Now k=10, y=13, x=?

from( i)

x = k y
x = 10 x 13
x = 130.

 TRY THIS…………………………..


x is directly proportional to y. x=30 and y=5. Find x while y=11.

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