**(I) Algebraic Expressions vs Equations**

The following are

**expressions**:

**3***x***5 - 2***y**p*+ 2*q*- 45**mn**

**equations**:

**2***x*= 4*x*+ 8 = 20*x*² = 36**2***x*+*y*= 4

*Can you tell the difference between an expression and an equation?***(II) Coefficients, Variables and Constants**

In the following algebraic expressions:

(a) 6*x*

*x*is a variable- 6 is the coefficient of
*x* - There is no constant

(b) 2*y* + 5

*y*is a variable- 2 is the coefficient of
*y* - 5 is the constant

(c) 3*m *+ 7*n *+ 9

*m*and*n*are variables- 3 and 7 are coefficients of
*m*and*n*respectively - 9 is the constant

(d) *p* + 2*q* - 45

*p*and*q*are variables- 1 and 2 are coefficients of
*p*and*q*respectively - -45 is the constant

*a -*3

*b +*1

*a*and*b*are variables- 5 and -3 are coefficients of
*a*and*b*respectively - 1 is the constant

(f) *x *- *y *

*x*and*y*are variables- 1 and -1 are coefficients of
*x*and*y*respectively - There is no constant

**When given an expression, are you able to pick out the variable(s), coefficient(s) and constant terms?**

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**Let's learn more terms that are related to Algebra through the Hangman activity** (select "Algebra")

Source:

http://www.subtangent.com/maths/flash/hangman-loadable.swf