Tuesday, 4 March 2014

INEQUALITIES C4

Find x if 4x – 12 ≤ x + 15 ≤ 6x + 6

Solution

4x – 12 ≤ x + 15 and  x + 15 ≤ 6x -10

4x – x ≤ 12+ 15 and  15 + 10 ≤ 6x - x

3x ≤ 27(divide by 3 both sides) and  25 ≤ 5x (divide by5 both sides)

x ≤ 9 and  5 ≤ x


x ≤ 9 and  x ≥ 5 

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