Y is directly proportional to x, and y=216 when x=2 Find y when x=7? Find x when y=540?

1 Answer
Brandon
Mar 7, 2018

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Explanation:

If something is proportional we use #prop#, as you stated it is directly proportionate, this shows that #y=kx#, where #k# is a value to be worked out.

Plugging in given values:

#216=k xx2#

#therefore# #k=216/2=108#

This can be written as:

#y=108 xx x#

Therefore to answer the first question, plugging in the values:

#y=108 xx 7=756#

Second question:

#540=108 xx x#

#therefore# #x=540/180=3#

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