Tolong di jawab harus di kumpulin besok​

Jawaban:

4.A=3x-2

B= 2x-4

A+B=3x-2+2x-4

= 5x-6

B+A=2x-4+3x-2

= 5x-6

A-B=3x-2-(2x-4)

=3x-2-2x+4

= x+2

B-A=2x-4-(3x-2)

=2x-4-3x+2

= -x-2

6. A=2x-1

B= 1-x

A+B=2x-1+1-x

= x

B+A=1-x+2x-1

= x

A-B=2x-1-(1-x)

=2x-1-1+x

= 3x-2

B-A=1-x-(2x-1)

=1-x-2x+1

= -3x+2

7. A=3x

B= 2x+1

A+B=3x+2x+1

= 5x+1

B+A=2x+1+3x

= 5x+1

A-B=3x-(2x+1)

=3x-2x-1

= x-1

B-A=2x+1-3x

=-x+1

8. A=5

B= 2x-4

A+B=5+2x-4

= 2x+1

B+A=2x-4+5

= 2x+1

A-B=5-(2x-4)

=5-2x+9

= -2x+9

B-A=2x-4-5

=2x-9