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