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Comparing both sides,we get
w = 4
z + 6 = 0
z = -6
x + y = 6 ........(1)
xy = 8
So,now let's take (x + y)²
Hence we get,
(x + y)² = x² + y² + 2xy
(6)² = x² + y² + 2×8
36 = x² + y² + 16
x² + y² = 36 - 16 = 20
x² + y² = 20 ..........(2)
Now let's take (x - y)²
Hence we get,
(x - y)² = x² + y² - 2xy
(x - y)² = 20 - 2×8 = 4 [Here we put the value of (2)]
x - y = 2 .........(3)
Now let's add (1) and (3)
(x + y) + (x - y) = 6 + 2
2x = 8
x = 4
Now put the value of x in (3)
4 - y = 2
4 - 2 = y
y = 2