14 $x^2 + y^2 + z^2 = 4$, $y = x$
Added by Brenda G.
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Substitute y = x into the first equation: x^2 + x^2 + 22 = 4 2x^2 = -18 x^2 = -9 This equation has no real solutions, since the square of any real number is always non-negative. Show more…
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