Two yards of fabric cost $13, and 5 yards of fabric cost$32.50. Which equation relates the cost of the fabric c to its length l?

$c = 6.5 l$
Cost is $6.50 per yard. Explanation: Just by reading out the equation in terms of the variables, I interpret: $2 l = 13$and $5 l = 32.5$After simplifying these, we get: $l = 6.5$. In context, this means that one yard of fabric costs$6.50. As the number of yard of fabric increases, cost increases, so
$c = 6.5 l$.