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If w, x, y, and z are real numbers satisfying

w + x + y = -2

w + x + z = 4

w + y + z = 19

x + y + z = 16

what is wx + yz?

 Oct 17, 2021
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Hello,

 

w = - \frac{11}{3}

x = - \frac{20}{3}

y = \frac{25}{3}

z = \frac{43}{3}

 

\((-\frac{11}{3}*(-\frac{20}{3}))+(\frac{25}{3}*\frac{43}{3})=\frac{1295}{9}=143\frac{8}{9}=143.\overline8\)

 

Straight

 Oct 17, 2021

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