Gr. 9 Algebra REVISION

True of false? In algebraic expressions we are allowed to add and subtract unlike terms.

• True

• False

Answer explanation

WE MAY ONLY ADD AND SUBTRACT LIKE TERMS! 😉

True of false? The MISSION of algebraic equations is always to get the variable alone.

• True

• False

True of false? When we think of algebraic equations, we must think of a balancing scale: what we do on the one side of the equal sign, we must do on the other side.

• True

• False

Answer explanation

Simplify (if possible): $48x^2y^3-12x^2y^3$  

•  $36xy$  

•  $36$  

•  $36x^2y^3$  

•  $48x^2y^3-12x^2y^3$  

Answer explanation

Like terms may be added and subtracted 

  Simplify (if possible): $36x+28y-19x+18y$ 

•  $17x+46y$  

•  $17y+46x$  

•  $63xy$  

•  $63x^2y^2$  

Simplify the following expression: $3\left(2a-5b\right)+2\left(5b-7a\right)$  

•  $8a+5b$  

•  $-9ab-4$  

•  $-9a-4b$  

•  $-8a-5b$  

Simplify the following expression:

 $\left(2x-3\right)^2$  

•  $4x^2+6x+9$ 

•  $4x^2-12x+9$  

•  $4x^2-9$  
  

•  $4x^2+12x+9$  

Solve the following equation:  $6y+2=74$  

• 6

• 8

• 10

• 12

Solve the following equation:  $\frac{a}{4}=9$  

• 36

• 72

• -36

• 12

Solve the following equation:  $5\left(x-2\right)=3x-4$  

• 2

• 3

• -3

• 4