To find the perimeter of a triangle, we simply need to add up the lengths of all three sides.
The lengths of the sides of our triangle are given as the expressions (9x + 3), (6x - 10), and (y - 2). Therefore, we can calculate the perimeter by adding these three expressions together.
We begin the calculation by writing out the sum:
(9x + 3) + (6x - 10) + (y - 2)
This gives us our final expression for the perimeter of the triangle. So, the perimeter of the triangle is represented by the expression (9x + 3) + (6x - 10) + (y - 2) centimeters.