If you graph a Linear equation it will be a strait line. If it doesn't come out strait, its not linear.
Also a linear equation can be put into y=mx+b, with mx meaning the slope and b meaning Y-intersept.
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On a linear scale, if two pairs of points are the same distance apart, their magnitudes differ by the same amount. So if distance from point A to B is the same as the distance from point C to D, then the magnitude of B-A is the same as D-C. On a non-linear scale this does not apply. On a logarithmic scale, for example, equal distances, as above would imply that B/A = D/C
Linear system follows principal of superposition and homogeneity and Non linear system does not follow the same.
No, but it is non-linear.
Linear elements :In an electric circuit, a linear element is an electrical element with a linear relationship between current andvoltage. Resistors are the most common example of a linear element; other examples include capacitors,inductors, and transformers.Nonlinear Elements :A nonlinear element is one which does not have a linear input/output relation. In a diode, for example, the current is a non-linear function of the voltage.Most semiconductor devices have non-linear characteristics.
It is linear in c and non-linear in d. If both c and d are variables, then it is non-linear.