10. Verify that a+b = b+a by taking (1)a= -7/5, b= -2/7
(2) a= -1, b=-2/3
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(1)a=-7/5 b=-2/7
a+b=b+a.
-7/5+(-2/7)=-2/7+(-7/5)
-7/5-2/7=-2/7-7/5
by taken LCM on both sides
- 49-10/35=-10-49/35
-59/35=-59/35
hence proved
a+b=b+a
(2)a=-1 b=-2/3.
a+b=b+a
-1+(-2/3)=-2/3+(-1)
-1-2/3=-2/3-1
taking LCM on both sides
-3-2/3=-2-3/3
-5/3=-5/3
hence proved a+b=b+a
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