Pg 644 (576) - Q6
Solving for x in the first equation by taking the square root of both sides (don’t forgetthat the square root of 16 can be +4 or -4), you get that x = 3 or -5. Doing the same with the second equation, you get that 7 = 3 or -3. Since x and y can be a combination of 3 and 3, 3 and -3, -5 and 3, or -5 and -3, there is no definitive relationship, so the answer is D.