Question

X-y=6, x+y=8, zx+zy=20

Answer 1

X = 7

Y = 1

Z = 2/5

Explanation:

7-1 = 6

7+1 = 8

2/5 × 7 + 2/5 = 20

Answer 2

Explanation:

x = 6 + y

6 + y + y = 8

y = 1

x - 1 =6

x = 7

zx + zy = z(x + y) = 20

z = 2.5