(M−1)X+2 MY+7Z+4=0 ; MP (Q)

Câu 11: Cho mp (P):

(m−

1)

x+

2 my

+7

z+

4

=0

; mp (Q):

2

x −

3

y

+

2

z+

4=0

. Để (P)

(Q) thì m = ?

A.

m = –1

B. m = –5

C. m = 3

D. m = 1