a+b=5 and 2a -b=6 subtitution
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a=5-b
substituting the value a in EQ (ii)
2a-b=6
2(5-b)-b=6
10-2b-b=6
10-3b=6
-3b=6-10
-3b=-4
b=-4/
a=5-b
substituting the value a in EQ (ii)
2a-b=6
2(5-b)-b=6
10-2b-b=6
10-3b=6
-3b=6-10
-3b=-4
b=-4/-3
b=4/3
a=5-4/3
a=11/3
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