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?
\(3x+3y+3z+3w=33\)
\(x+y+z+w=11\)
\(w=-1\)
\(z=13\)
\(y=7\)
\(x=-7\)
\(7+81=88\)
I am assuming you mean w*x+y*z
