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10 point, dijawab 2 saja
1][
¼ (5p-1) ≥ ¼ (2p+1) kali 4
5p - 1 ≥ 2p + 1
3p ≥ 2
p ≥ 2/3 ←
2][
⅓ (y+2) + ½ (y-1) > 1 kali 6
2 (y + 2) + 3 (y - 1) > 6
2y + 4 + 3y - 3 > 6
5y > 5
y > 1 ←
bonus 1 lagi
3][
2/5 (1-2×) - ⅓ (2-×) ≥ ⅔ kali 15
6 (1 - 2x) - 5 (2 - x) ≥ 10
6 - 12x - 10 + 5x ≥ 10
-7x ≥ 14
x ≤ - 2 ←