2007-04-16 09:03:10 · 4 answers · asked by Sable 1 in Science & Mathematics ➔ Mathematics
I assume _< means ≤
18 ≤18y - 18
18 + 18 ≤ 18y - 18 + 18
36 ≤ 18y
36 / 18 ≤ 18y / 18
36 / 18 ≤ y
2 ≤ y
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The inequality symbol does not change unless dividing or multilying by a negative number. not transposing.
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2007-04-16 10:00:43 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
18 + 18 _< 18y
36 _< 18y
2 _< y
Check: y = 10
18 _< 180 - 18 true!
y = 0
18 _< 0-18 false!
y = 2
18 _< 36 - 18
18 _< 18 true!
y is greater or equal to 2
2007-04-16 09:09:39 · answer #2 · answered by Joe the Engineer 3 · 0⤊ 0⤋
18y - 18 ≥ 18
18y ≥ 36
y ≥ 2.
2007-04-16 09:07:27 · answer #3 · answered by S. B. 6 · 0⤊ 0⤋
-18y <= -36
y>=2
The S.S is [-2,infinity[
2007-04-16 09:11:13 · answer #4 · answered by a_ebnlhaitham 6 · 0⤊ 0⤋