Addition and Subtraction of Linear Expressions

Quick Check:

Add the linear expression:

(3x + 6) + (3x – 5)

Quick Check:

Add the linear expression:

(x + 4) + (–2x – 6)

Quick Check:

Add the linear expression:

(5x + 4) + (7x + 1) + (-3x - 4)

Subtract the expression:

(4x + 1) – (3x + 5)

Subtract the expression:

(2x – 3) – (x – 2)

Subtract the expression:

(4x – 6) – (2x – 4)

Subtract the expression:

(–2x – 4) – (2x)

Subtract the expression:

(–7x – 6) – (7x)

Subtract the expression:

(12x + 8) – (6x + 2)

Subtract the expression:

(–4x – 7) – (–5x – 2)

Subtract the expression:

(–5x – 9) – (–6x – 1)

A bakery wants to know how many more chocolate chip cookies than sugar cookies were sold last month. The number of chocolate chip cookies sold is represented by the expression 7n + 6. The number of sugar cookies sold is represented by the expression 6n – 3. Write an expression to show how many more chocolate chip cookies were sold last month. Then evaluate the expression if n equals 15.