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3. a-6=10-a
⇔a+a=10+6
⇔2a=16
⇔a=8
1/2b=-5
⇔b=-10
7. A=B
⇔x=5-y⇔ x+y=5
x-2y=11
______-
-y=-6 ⇔y=6
B=C tidak kelihatan matriks C nya.
9. a₁₁=3-2=1, a₁₂=3-4=-1, a₂₁=6-2=4, a₂₂=6-4=2, a₃₁=9-2=7, a₃₂=9-4=5
Semangat!