The only consistent right answer will be B.
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First you need to simplify the left side of the equation to get

Then you add by two on both sides to get

Finally you divide by 2 on both sides to get
Each calculator would cost 30 dollars (sorry if this isn't what you mean)
1. x=−y+8−z
2.x=−7−4y−5z (everything over 4)
3.x=2−z
1.y=-x+8-z
1.z=-x+4-y
2.y=7+4x-5x (everything over 4)
2.z=7+4x-4y (everything over 5)
3.z=2-x
Answer:
First option, relation 1 and relation 4
Step-by-step explanation:
Because they both cross one of the two axes once, which from what I remember, makes it a function.
Hope this makes sense, and please correct me if I'm wrong :)