How do you find the direct variation equation if z is directly proportional to r when #r=412#, #z=51.5#?

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Answer 1 · 2014-10-26T02:09:13

Direct variations are expressed in the form

#y = kx#

where #k# is a constant

For your problem, #z # is directly proportional to #r#

#z = kr#

#51.5 = k(412)#

#k = 51.5/412#

#k = 1/8#

#=> z = 1/8r#