Suppose y varies directly with x and y = 3 when x = 12. what is the value of y when x = 40
2 answers:
y varies directly with x
so y = kx
y = 3 when x = 12 then 3 = 12k so k = 3/12 = 1/4
If x = 40 then
y = kx
y = 1/4( 40)
y = 10
Answer
y = 10 when x = 40
10 because if you divide 12 by 3 it will give you 4 x=4 and 3 by itself and you would get y=1 in order to get 40 you will have to multiple for by 10 and multiply y by 10
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