Sаrаh went shоpping fоr hоlidаy presents. She bought gift cards and tree ornaments for her coworkers. The gift cards cost $10 each and tree ornaments cost $8.50 each. She buys a total of 46 presents and spends $427. How many gift cards and tree ornaments. Identify the variables, write the system of equations, solve the system of equations and write the answers clearly.