Delaney is a city engineer and needs to create a scale map of the city. She has graphed several landmarks on Main Street, including the gas station and the post office. The city is drawing up plans to construct a road perpendicular to Main Street. What must be the slope of the new road in order to prove it is perpendicular to Main Street? Express your answer as a whole number or fraction. (1 point)
The slope of a line perpendicular to another line is the negative reciprocal of the slope of the original line. Therefore, the slope of the new road must be the negative reciprocal of the slope of Main Street.
