I'm confused with transitive property, substitution postulate, addition postulate, and subtraction postulate. What are they? and What are the differences between them?

go to goole

i mean google

http://library.thinkquest.org/2647/algebra/post.htm

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if x =3 and y= -4, find the value of 8x - 10y

if x =3 and y= -4, find the value of 8x - 10y