Review simplifying algebraic expressions (year 9)

 $2x+1+7x$  

• 10x

• 10

• 9x + 1

• 9 + 1x

x - (2x + 3)

• 3x + 3 + x
• -2x + 3

• -2x-3

• -x+3

Simplify by combining like terms:
5a + 2b - 3a + 4

• 8a + 2b + 4
• 2a + 2b + 4
• 8ab
• 4ab + 4

How many terms are in the expression below:
3x - 6 + 4b + 5 + 7 - 2x

• five
• eight
• six
• nine

 $-5\left(-6+7r\right)-5\left(r+3\right)$  

• 45 + 30r

• 45 – 40r

• 15 + 30r

• 15 – 40r

 $7x\ +\ 8y-3x-12y$  

•  $10x-4y$  

•  $4x-4y$  

•  $4x+4y$  

•  $10x+4y$  

• 27a²

• 12a²

• 27aa

• 12aa