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?
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
