What is the slope of a line perpendicular to the line whose equation is y= -2x+9?

Answer 1

Slope for perpendicular lines are the negative reciprocals. This slope given is -2/1 Since this is negative, the slope to the perpendicular line is positive. The reciprocal of 2/1 is 1/2.

m=1/2

Answer 2

Slope of the perpendicular line is 1/2. The slope for any perpendicular line is the negative reciprocal of the given slope; you simply flip the slope (-2 in this case) and change the sign. A way to check your answer is that the product of the two slopes is always -1.