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- 4 ≤ 3x + 5 ≤ 8
- 4 - 5 ≤ 3x + 5 - 5 ≤ 8 - 5 [semua ruas dikurangi 5 agar hanya 3x di bagian tengah]
- 9 ≤ 3x ≤ 3
[- 9]/3 ≤ [3x]/3 ≤ [3]/3 [semua ruas dibagi 3 agar bagian tengah hanya x)
Diperoleh -3 ≤ x ≤ 1
∴ HP = { x Ι - 3 ≤ x ≤ 1, x ∈ R }
[5d].
x - 1 ≤ 2x + 1 ≤ 3 + x
x - 1 - x ≤ 2x + 1 - x ≤ 3 + x - x [semua ruas dikurangi x agar hanya 2x di bagian tengah]
- 1 ≤ x + 1 ≤ 3
- 1 - 1 ≤ x + 1 - 1 ≤ 3 - 1 [semua ruas dikurang 1 agar hanya x di bagian tengah]
Diperoleh - 2 ≤ x ≤ 2
∴ HP = { x Ι - 2 ≤ x ≤ 2, x ∈ R }