Answer:
option A
Step-by-step explanation:
X - 2Y = Z
[tex]\left[\begin{array}{cc}b&a\\4&a\\\end{array}\right]-2\left[\begin{array}{ccc}c&d\\a&b\end{array}\right]=\left[\begin{array}{ccc}a&c\\16&b\end{array}\right] \\\\\left[\begin{array}{cc}b&a\\4&a\\\end{array}\right]-\left[\begin{array}{ccc}2c&2d\\2a&2b\end{array}\right]=\left[\begin{array}{ccc}a&c\\16&b\end{array}\right] \\\\[/tex]
4 - 2a = 16
-2a = 16 - 4
-2a = 12
a = 12/-2
a = -6
a - 2b = b
-6 - 2b = b
-6 = b + 2b
-6 = 3b
-6/3 = b
b = -2
b - 2c = a
-2 - 2c = -6
-2c = -6 +2
-2c = -4
c = -4/-2
c = 2
a - 2d = c
-6 - 2d = 2
-2d = 2 + 6
-2d = 8
d = 8/-2
d = -4
