tolongin jawab nomer 2 sama 3

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2. [A]=[B]
x = 4

3 = y - 1
y = 3+1
y = 4

z = -2

3. [P] = [Q^t]
2x - y = 7 || X2
x + 2y = -4||X1

4x - 2y = 14
x + 2y = - 4
(di tambahkan)
5x = 10
x = 10/5
x = 2

x + 2y = -4
2 + 2y= - 4
2y = - 4 + 2
2y = -2
y = - 1

x - y = 2  -(-1)
x - y = 2 +1
x - y = 3