Question

Va rog, d: 2x+y+1=0, M(1,-1), calculati ecuatia perpendicularei duse din M pe dreapta d?

Answer 1

d:2x+y+1=0

md=-2/1=-2

md'=-1/md=1/2

d':y-yM=md'(x-xM)

d':y+1=x/2-1/2

d':-x/2+y+3/2=0 |•2

d':-x+2y+3=0