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In a linear equation, the highest power of all variables is 1.

eg

y = x + 3

In this example, the variable (x) has a power of 1 (remember, x1 is the same as x).

Therefore, a linear equation.

eg 2

y = x2 +7

eg 3

y = p3 + p - 89

In example 2 and 3, variables have a power higher than 1.

Hence, they are non-linear equations.

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