If a - b = b - 3 = 6, what is the value of a?

A.) -3

B.) 6

C.) 9

D.) 15

E.) 18

A.) -3

B.) 6

C.) 9

D.) 15

E.) 18

If b - 3 = 6

b = 9 {added 3 to both sides}

If a - b = b - 3, and b is 9

a - 9 = 9 - 3 {substituted 9 in for b}

a - 9 = 6 {subtracted on right side}

a = 15 {added 9 to both sides}

**D.) 15**

*- Algebra House*