1.

X+y21 & x-y=3 find value of x& y

Answer»

X+ y = 21 , x-y = 3
on ADDING
x+y = 21
x- y = 3
-----------
2x -0 = 24
2x = 24
x = 24/2
x = 12

to find y
x- y = 3
12 - y = 3
y= 3 -12
y = -9

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