Answer:
2 2
1 -3
Step-by-step explanation:
2b=[4 4]
2 -6
b=[4/2 4/2]
2/2 -6/2
b=[2 2]
it is correct
<u>Step 1: Subtract 21 from both sides</u>
<u>Step 2: Divide 8 from both sides</u>