Darcy gave her nail technician a $5.10 tip.
Tip Amount = $5.10
The tip was 6% of the cost of the manicure.
b be the cost of the manicure
So,
6% of cost of the manicure= Tip Amount
6% of b = 5.10
Equation of the cost is :

The equation is : 0.06b = 5.10