A straight line represents direct proportionality between the two variables. It cannot be represented as:

y = m x - c

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y = m^{2} x

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y = m x^{2}

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y = m x + c

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Solution

The correct option is C $y = m x^{2}$
Equations given in options A, B and C represent straight line but the equation given in statement C represents parabola.

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