a. | Ahmed
made sure that there was only one equal sign in each step. |
b. | Cathy and Ahmed checked the solution by substituting the answer for the
variable to make the equation true. 3(3) + 3 = 12. |
c. | Cathy wrote the balance problem as an algebraic equation using the variable
l. l represents the number of counters that equal the weight of each lamp.
3l + 3 = 12. |
d. | Cathy and Ahmed
solved for the variable l. 3l = 9, l = 3. |
e. | Ahmed took away 3 counters from each side, and both sides balanced.
3l + 3 3 = 12
3. |