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WEEK 5
TOPIC: EQUATIONS WITH FRACTIONS.
CONTENTS:
- Clearing fractions (revision)
- Algebraic fractions with: (i) unknown at the numerator. (ii) Unknown at the denominator (iii) binomial denominators.
- Change of subject of formulae and substitution.
CLEARING FRACTIONS/ ALGEBRAIC FRACTIONS WITH UNKNOWN AT THE NUMERATOR
Equations such as 2/3+ x=1, 3x/2+ 3/5=10, 2y/5=3/5 e.t.c are equations involving fractions.
To solve any of these equations, we consider the L.C.M of the denominators and multiply each term of the equation by the L.C.M to clear the fractions and solve the equation as usual.
Example 1
Solve the equation: (x-4)/5=2- x/2
Solution
The denominators of the fractions in this equation are; 5 and 2.
L.C.M of 5 and 2 is 10.
We multiply through by this L.C.M. i. e10×((x-4))/5= (2×10) -(10×x/2) = 2(x-4) = 20 – 5x
Opening brackets, we have,
2x- 8 = 20 – 5x
Collecting like terms we have,
5x + 2x = 20 +8
7x = 28.
Thus, x = 28/7 = 4
Example 2
Solve 2x/3 + 4/5= 17/15
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