exam Maths Puzzle Numerical Ability

m-6=1/2(8-18m)

6b+2(b+1)=-14

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exam Other Question

In Exercises 51 to 54, find the constant of variation k. See Example 9 (p 556) in the text.

52) m varies directly with n; m = 144 when n = 8.
how do i simplify this problem? y^3/5( y^1/2-y^-1/2)

thanks

J