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y = m_{1} x + c_{1}

y = m_{2} x + c_{2}

m_{1} = m_{2}, m_{1} m_{2} = 1

m_{1} + m_{2} = 0, m_{1} m_{2} = - 1

m_{1} = m_{2}, m_{1} m_{2} = - 1

m_{2} = - m_{1}, \sqrt{m_{1} m_{2}} = - 1

ANS : 3

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