Determine the location of a point (x, y, z) that satisfies the given condition. xyz > 0

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?

We just started the introduction into circles and i have no idea how to do this.

Which function has the domain x> -11