Answer:
C and D
Step-by-step explanation:
We want to find the equations where b=11 is a solution. Let's test each answer. choice. Plug 11 in for b and solve.
A. 2b= 211
2(11)=211
Multiply 2 and 11.
22≠211
22 does not equal 211, therefore this choice is not correct.
B. b+18=7
11+18=7
Add 11 and 18.
29 ≠ 7
29 does not equal 7, so this is not correct.
C. 77=7b
77=7(11)
Multiply 7 and 11.
77=77
77 does equal 77, so this is correct.
D. 9=b-2
9=11-2
Subtract 2 from 11.
9=9
9 equals 9, so this correct too.
E. 11=33/b
11=33/11
Divide 33 by 11.
11≠3
11 does not equal 3, so this is not the right choice.
b= 11 is a solution for C. 77-7b and D. 9=b-2
