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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 = 15

what is wx + yz?

 Nov 30, 2021
 #1
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Using matrices

w=-3   x=-7    y=8     z=14

 Dec 1, 2021

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