Answer:
6.89 + t = 8.00
Step-by-step explanation:
The amount that she left $8.00 includes the amount she owed ($6.89) plus a tip for the waiter t. It means that $8.00 is equal to $6.89 plus the tip t.
Therefore, the equation is:
8.00 = 6.89 + t
Or which is equal
6.89 + t = 8.00
Then, the answer is:
6.89 + t = 8.00