Question

efetue adições e subtrações
( a ) ( +6x ) + ( -4x )

( b ) ( +9 ) - ( +7x )

( c ) ( -2y ) - ( +4y )

( d ) ( +6a ) + ( -3a )

Answer 1

( a ) ( +6x ) + ( -4x ) 
+6x-4x
2x

( b ) ( +9x ) - ( +7x ) 
+9x-7x
2x

( c ) ( -2y ) - ( +4y ) 
-2y-4y
-6y

( d ) ( +6a ) + ( -3a )
6a-3a
3a

Answer 2

a) ( 6x ) + ( - 4x ) = 6x - 4x = 2x

b) ( 9 ) - ( 7x ) = 9 - 7x

c) ( - 2y ) - ( 4y ) = -2y -4y = -6y

d) ( 6a ) + ( - 3a ) = 6a - 3a = 3a