( 94 ) 
(0 (a)' 
From 3 a From 2 b 
Take a Take b 
b 21 x 
~W 
From gy 
Take jy 
In the firft and fecond of thefe examples, 
the figns, in both quantities, are alike: but, 
if I fuppofe the fign of the fufttrahend to 
be reverfed, they are then oppofite. Now 
the rule in Addition is, when thejigns are not 
the fame tfubtr aft the lefsfrom the greater^ and 
put down the remainder with the Jign of the 
greater: hence a from 3^, and the remain- 
der is 2 a. In like manner b from 2^, 
there remains b. 
In the third and fourth examples, the 
figns are oppofite; but fuppofing the figns 
of the fubtrahends to be reverfed, they will 
then become fimilar to thofe of the quan- 
tities above them: I have therefore nothing 
to do but to add the figures, (which are 
called Coefficients,) as in common Arithme- 
tic, prefixing the common fign of both. 
Thus 
