Question

Ada yg bisa jawab gak ? Pakai cara !

Answer 1

Persamaan:

p - 2s = 1 ... (1)

2r - q = -1 ... (2)

q - r = -1 ... (3)

s - 2p = 1 ... (4)

(1) dan (4)

p - 2s = 1

p = 1 + 2s

s - 2 (1+2s) = 1

s - 2-4s = 1

-3s = 3

s = -1

p - 2(-1) = 1

p = -1

(2) dan (3)

q - r = -1

q = -1 + r

2r - q = -1

2r - (-1+r) = -1

2r + 1 - r = -1

r = -2

q = -1 - 2

= -3

Nilai p+q+r+s = (-1) + (-3) + (-2) + (-1)

= -7 (A)

Semoga membantu ;)