Question

Solusi dari sistem persamaan {x−y = 5 x 2 − y2 = 45 adalah..

A. {10,5}
B. {9,4}
C. {6,1}
D. {7,2}
E {8,3}

Answer 1

X - y = 5

x = y + 5

x² - y² = 45

(y + 5)² - y² = 45

y² - y² + 10y + 25 = 45

10y = 45-25

y = 20/10

y = 2

x = 2 + 5

x = 7

hp = { 7, 2 }

jawaban : D

Answer 2

Jawabannya E. Cara : Dik = X-y=5x2-y2=45 Jawab = 5 × 2 = 10 - 2y = 8 , 5-2 = 3 (8,3)