Answer:
r = 6
s = 2
u = 2
Step-by-step explanation:
Given:
r + 2s - u = 8 ...........(1)
s + u = 4
or
s = 4 - u .........(2)
r - s - u = 2
or
r = 2 + s + u ................(3)
substituting 2 in 3, we get
r = 2 + (4 - u) + u
or
r = 6
substituting r in 1 we get
6 + 2s - u = 8
or
2s - u = 2 ..............(4)
substituting 2 in 4 we get
2(4 - u) - u = 2
or
8 - 2u - u = 2
or
-3u = -6
or
u = 2
substituting u in 2, we get
s = 4 - 2 = 2
hence,
r = 6
s = 2
u = 2
