Question

If line one has a slope of 2, what does the slope of line 2 need to be if the lines are perpendicular?

Answer 1

if slope of 1 line is m1, nd slope of perpendicular line is m2
then they should satisfy the condition (m1)(m2)=-1

so (2)(m2)=-1

som2=-1/2

Answer 2

m2=-1/2, slope of other line, u can prove it also, refer to ur textbook portion, straight lines