Monday, February 13, 2017

04 ALGEBRA - EXPRESSION & EQUATIONS

Algebra: Equation vs Expression

(I) Algebraic Expressions vs Equations
The following are expressions
  • 3x
  • 5 - 2y
  • p + 2q - 45
  • mn
The following are equations:
  • 2x = 4
  • x + 8 = 20
  • x² = 36
  • 2x + y = 4
Can you tell the difference between an expression and an equation?

(II) Coefficients, Variables and Constants
In the following algebraic expressions:

(a) 6x
  • x is a variable
  • 6 is the coefficient of x
  • There is no constant
(b) 2y + 5
  • y is a variable
  • 2 is the coefficient of y
  • 5 is the constant
(c) 3+ 7+ 9
  • and are variables
  • 3 and 7 are coefficients of and respectively
  • 9 is the constant
(d) p + 2q - 45
  • and are variables
  • 1 and 2 are coefficients of and respectively
  • -45 is the constant
(e) 5a - 3b + 1
  • and are variables
  • 5 and -3 are coefficients of and respectively
  • 1 is the constant
(f) 
  • and are variables
  • 1 and -1 are coefficients of 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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