Hey there!!
Total length of the fabric bought = 3 1/4 yards
First, let's convert this mixed fraction to improper fraction
3 1/4 = 13/4
The total cost for 13/4 yards = $13
Find cost per yard
Let's take the cost per yard as ' x '
Then, 13/4 yards = 13x / 4
Let's get this into an equation -
13x/4 = 13
Multiply by 4 on both sides
13x = 52
Divide by 13 on both sides
x = 52 / 13
x = 4
The cost per yard = $4
Hope my answer helps!