Squire leathers produces two sizes of wallets from cowhide. the first requires 60 squire inches of cowhide and the second requires 100 square inches. the company has 1000 square feet of cowhide. part of the model is:

For this case we have that part of the model is:
 Let:
 x = number of wallets of the first model (60 squire inches of cowhide)
 y = number of wallets of the second model (100 square inches).
 The equation that best represents this model is:
 60 * x + 100 * y = 1000
 answer
 part of the model is: 60 * x + 100 * y = 1000