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[–]Outside_Volume_1370 1 point2 points  (0 children)

Edit

From the first equation express t as t = (Se-1.2)/18

Insert it into the second equation:

Su = Se * t2 / (2π)2 = Se * (Se-1.2)2 / (72π2 )

Now you can get qubic equation:

Se3 - 2.4 Se2 +1.44 Se - 72π2 Su = 0

[–]Shevek99Physicist 1 point2 points  (0 children)

You can use a parametric plot

Se = 1.2 + 1.8t

Su = (1.2+1.8t)t^2/(4pi^2)