by seeing if it has a common difference by subtracting the bigger number from the little number and getting the same number over and over and if it does that`s a common difference
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It means if you plot the function it is not on a straight line For example y = 3x + 4 is linear function y = x squared is non linear
I your highest power of your variables is 1 then it is linear. y=x+5 is linear
If you mean y = 5x-3 then it is the linear equation of a straight line
It is a non-linear function of theta.
Below is a rule that is an example of a non-linear function when b is 49, a is 7 and a is a function of b: a = square root of b 7 = square root 49 7=7