Which of the following can be the equation of the supply curve?

$q = \frac{2}{p}$

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$p q + p + 2 q = 0$

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$3 q + 0.5 p = 8$

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$q - 0.4 p + 2 = 0$

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Solution

The correct option is D
$q - 0.4 p + 2 = 0$

The supply curve is upward sloping. Among the given options, only q - 0.4p+ 2=0 has a positive slope.

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