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

 

w+x+y = -2

w+x+z = 4

w+y+z = 19

x+y+z = 12

 

What is wx + yz?

 Jan 5, 2022
 #1
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w+x+y = -2

w+x+z = 4

w+y+z = 19

x+y+z = 12

 

\(3x+3y+3z+3w=33\)

\(x+y+z+w=11\)

\(w=-1\)

\(z=13\)

\(y=7\)

\(x=-7\)

\(7+81=88\)

 Jan 5, 2022
 #2
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I am assuming you mean w*x+y*z

Guest Jan 5, 2022

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