5(ii)
Solve the following inequation. Write down the solution set and represent it on the real number line.
-5(x - 9) ≥ 17 - 9x > x + 2, x ∈ R.
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Given, equation :
-5(x - 9) ≥ 17 - 9x > x + 2
Solving L.H.S. of the given equation :
⇒ -5(x - 9) ≥ 17 - 9x
⇒ -5x + 45 ≥ 17 - 9x
⇒ -5x + 9x ≥ 17 - 45
⇒ 4x ≥ -28
⇒ x ≥ $-\frac{28}{4}$
⇒ x ≥ -7 ............(1)
Solving L.H.S. of the given equation :
⇒ 17 - 9x > x + 2
⇒ x + 9x < 17 - 2
⇒ 10x < 15
⇒ x < $\frac{15}{10}$
⇒ x < $\frac{3}{2}$
⇒ x < 1.5 .............(2)
From equation (1) and (2), we get :
Solution set : {x : -7 ≤ x < 1.5}
Solution set on the number line :
