Question

Line a y=1/2x+2

line b y= -1/2 x +7
line c y=2x +4
line d y= 1/2x +5/4

which lines are perpendicular

Answer 1

b and c

Explanation:

Have a look at lines b and c. Note that the two slopes (-1/2 and +2) are negative reciprocals of one another. This is a sure sign that lines b and c are perpendicular.