Page 37 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

48x = 4 x 12 x x
4 is the coefficient of 12x . x is the coefficient of 48.
Equation
It is a statement of equality between numbers or numbers and algebraic symbols.

12 = 6 x 2, 13 + 5 = 18.
2x + 9 = 5, y – 7 = 4y + 5.
Simple equation
Equations involving algebraic symbols to the first power are simple equations.
2x + 4 = 10. 4x + 12 = 14.

Addition
1 8a + 12b - a - 14b
= 8a - a + 12b - 14b
= 7a - 2b

2 14a + 3a + 25b + 2b + b
= 17a + 28b
3 (2a + 3b - c) + (4a - b - c) + (a - 8)
2a + 3b - c + 0
4a - b - c + 0
a + 0 + 0 - 8

______________________
7a + 2b - 2c - 8
______________________
4 Add : (3x + 3z) ; (5x - 4y); (9y - 3z)

3x + 0 + 3z
5x - 4y + 0
0 + 9y - 3z
______________________
8x + 5y

Subtraction
1 38xy - 15xy = 23xy
2 Subtract 3xy from -4xy
-4xy
+3xy

_______
-7xy
_______
3 Subtract 5x from 12x
= 12x - (5x)

= 12x - 5x
= 7x

24

CITS : WCS - Electrical - Exercise 4