Question

if the slope of line l is -2/5, what is the slope of line m so that line l is perpendicular to line m?
a. -2/5
b. -5/2
c. 2/5
d. 5/2

Answer 1

@DemolisionWolf

Answer 2

their slope multiplation must be -1

Answer 3

i think it is c

Answer 4

m.(-2/5)=-1

Answer 5

m=5/2

Answer 6

so its D?

Answer 7

yea D

Answer 8

here is the equation to get the slope of a perpendicular line:
\[m_1(m_2)=-1\]

let m_1 represent the slope of the line we know, -2/5
and m_2 represents the slope of the line that we want to be perpendicular.

plug in m_1 = -2/5 into the equation:
\[(\frac {-2}{5})(m_2)=-1\]
solve for m_2