Answer:
A) The value of a is 29.
B) The value of b is greater than 29.
C) In both part A and part B we have used a common property which is addition property and that we have add 9 on both side of equation in both parts.
D) The value of a in part A is equal to 29 whereas in part B the value of b is greater than 29.
Step-by-step explanation:
Solving for Part A.
Given,
[tex]a-9=20[/tex]
We have to solve for a.
[tex]a-9=20[/tex]
By using addition property of equality, we will add both side by 9;
[tex]a-9+9=20+9\\a=29[/tex]
Hence the value of a is 29.
Solving for Part B.
Given,
[tex]b-9>20[/tex]
We have to solve for b.
[tex]b-9>20[/tex]
By using addition property of inequality, we will add both side by 9;
[tex]b-9+9>20+9\\b>29[/tex]
Hence the value of b is greater than 29.
Solving for Part C.
In both part A and part B we have used a common property which is addition property and that we have add 9 on both side of equation in both parts.
Solving for Part D.
The value of a in part A is equal to 29 whereas in part B the value of b is greater than 29.