If and , with y · z ≠ 0, what is the value of

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If <img alt='Images' src='https://www.fatskills.com/images3/gmat/c0196-01.jpg'/> and <img alt='Images' src='https://www.fatskills.com/images3/gmat/c0196-02.jpg'/>, with <em>y</em> · <em>z</em> ≠ 0, what is the value of <img alt='Images' src='https://www.fatskills.com/images3/gmat/c0196-03.jpg'/>