JAWABAN UTS
METEMATIKA EKONOMI ;
1. Dik
: P1 = Rp. 100 ;
P2 = 140
Q1 = Rp. 1000 ; Q2 = 900
Dit
: Tentukan fungsi permintaan beserta grafik fungsinya ?
Jawab
;
P
– P1 / Q – Q1 =
P2 – P1
/ Q2 – Q1
P
– 100 / Q – 1000 = 140 – 100 / 900 – 1000
P
– 100 / Q – 1000 = 40 / - 100
-
100 P + 10000 = 40Q – 40000
-
10 P + 1000 = 4Q – 4000
-
10 P = 4Q
– 4000 – 1000
-
10 P = 4Q – 5000
P = - 0,4 Q + 500 atau
P = 500 – 0,4 Q
2. Dik
: P1 = Rp. 1400 Q1
= 1000 unit
P2 = Rp. 2000 Q2 = 1500 unit
Dit : Tentukan fungsi penawarannya beserta grafik
fungsinya ?
Jawab ;
P
– P1 / Q – Q1 = P1
– P2 / Q1 – Q2
P
– 1400 / Q – 1000 = 1400 – 2000 / 1000 – 1500
P
– 1400 / Q – 1000 = - 600 / - 500
-
500 (P – 1400) = - 600 (Q – 1000)
-
500 P + 700000 = - 600 Q + 600000
-
500 P = - 600 Q + 600000 - 700000
-500
P = -600
Q – 100000
P
= 6/5
Q + 200
3 3. L i m =
√(⅓x² + 4x – 5) / (6x² + 8x – 2)
x →∞
L i m = √(⅓x²/
x²+4x/ x² - 5/ x²) / (6 x²/ x² + 8x/ x² - 2/x²)
sama-sama / x²
x →∞
L i m = √(⅓
+ 4/x - 5/ x²) / (6 + 8/x - 2/x²)
x →∞
= √(⅓ + 4/∞ - 5/ ∞²) / (6 + 8/∞ - 2/∞²)
= √(⅓
+ 0 – 0) / (6 + 0 – 0)
= √(⅓ / 6)
= √2
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