Can someone pls tell me this answer which I have shown in the screenshot pls

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Pls! does anybody know a shortcut for answering these types of questions in the future?