If the two lines with slope m1 and m2 are perpendicular then their slo – McqOptions

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1.	If the two lines with slope m1 and m2 are perpendicular then their slopes has relation ______
A.	m<sub>1</sub> + m<sub>2</sub> = 1
B.	m<sub>1</sub> * m<sub>2</sub> = 1
C.	m<sub>1</sub> * m<sub>2</sub> = -1
D.	m<sub>1</sub> + m<sub>2</sub> = -1
Answer» D. m<sub>1</sub> + m<sub>2</sub> = -1

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