Adding and Subtracting Linear Expressions

When you subtract a linear expression, 

• you change the subtraction sign to an addition sign.

• you change the signs of the terms in the second expression.

• all of the above.

Simplify the expression by combining like terms:

2r + 2 + 5r - 2 + r 

• 8r 

• 8r - 4 

• 12r 

• 7r + 4 + r 

Put the three keys to subtracting linear expressions in their proper order!

• Keep the first expression the same

• Change the subtraction sign to addition

• Change the signs in the second expression

(-8x + 1) - (8x - 1)

• 0

• -16x + 2

• 2

• -16x

Find the sum:
(7k + 9) + (4k - 3)

• 3k + 6 

• 11k + 6

• -11k + 6

• - 3k + 6

Simplify the expression.

(4x + 3) - (2x - 1)

• 6x + 2

• 2x + 4

• 2x -2

Find the difference (2x + 5) − (x + 4).

• x + 1

• 3x + 9

• −x + 1

• x + 9

(7a + 4) - (9a + 2)
^{(its subtraction not addition)}

• -2a + 6

• 16a + 6

• -2a + 2

• 2a + 2

Add these expressions (12x+14) + (4x-15)

• 16x - 1

• 35x

• 8x + 1

• 16x - 29

3(3x - 5) - 3(3x - 4)

• -3

• -9

• 18x - 3

• 6x - 9