Three planes x + y = 0, y + z = 0, and x + z = 0
A. none of these
B. meet in a line
C. meet in a unique point
D. meet taken two at a time in parallel lines
Answer:C
Three planes x + y = 0, y + z = 0, and x + z = 0
A. none of these B. meet in a line C. meet in a unique point D. meet taken two at a time in parallel lines