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Cancelling out unknown variables

Cancelling out unknown variables

Cancelling out unknown variables

(OP)
Is there a way to cancel out an unknown variable using 2 different equations by displaying the answer to the first equation as a function of the unknow.

See example:

Equation 1
s/n = 0.75x + 0.25y
x(120), y(200)

s/n = 140
s= 140n

Equation 2
K = (k*n)/s = (k*n)/(300n) = k/300 (and assume that k is a known variable).

The exact formulas I am trying to use are attached, but the technical guide they came from unhelpfully uses n to define three different variables (in my calculation I have input them as n, n(1) and n (2), with n being the unknown I am trying to cancel out).

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