Bailey buys two shirts. The blue shirt costs $13, which is $2.50 more than the price of the red shirt. What is the cost of the red shirt? Write and solve an equation to find the answer, using r to represent the cost of the red shirt.(1 point)
Let r be the cost of the red shirt.
The cost of the blue shirt is 13 dollars.
The cost of the blue shirt is r + $2.50.
So r + $2.50 = 13.
Thus r = $13 - $2.50 = $<<13-2.5=10.50>>10.50. Answer: \boxed{10.50}.