Does this graph represent a function? why or why not?

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

2x minus y equals 6, x plus y equals negative 3