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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 | |