Select a number of different values for the independent variable (usually x). For each x, calculate the value of the dependent variable using the nonlinear equation. Call these f(x).
On a Cartesian plane, mark the points whose coordinates are(x,f(x)) and join them by a smooth curve.
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y=x2 and y=lnx are two examples of nonlinear equations.
a straight line
Isolating a variable in one of the equations.
One can solve equations of motion by graph by taking readings of the point of interception.
In general, a system of non-linear equations cannot be solved by substitutions.