If #y# varies directly with #x# and #y=20# when #k=4#, what is the value of #x#?

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Sep 14, 2016

Answer:

#5#

Explanation:

If #y# is directly proportional to #x# then there exists #k in RR# such that #y=kx#.
In this case, #y=4x#.

Hence #x=y/k=20/4=5#

Graphically :

graph{4x [-46.22, 46.25, -23.1, 23.16]}

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