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panjang = x + 3
keliling = 2(p+l)
= 2(x+3 + x)
= 4x + 6
keliling < 26
4x + 6 < 26
4x < 20
x < 5
lebar < 5
panjang < 8
2) k = 2(p+l)
k = 2(3x+2 + 2x+5)
k = 10x + 14
k <= 74
10x + 14 <= 74
10 x <= 60
x <= 6
p <= 3(6) + 2
<= 20
l <= 2(6) + 5
<= 17
luas maksimum = 20 x 17 = 340
3) 2x - 1 > x + 2
2x - x > 2 + 1
x > 3
4) 3x+1 > x + 14
3x - x > 14 - 1
2x > 13
x > 13/2
5) 5x + 4 < 19
5x < 19 - 4
5x < 15
x < 3