jika x adalah dua kali y dan y adalah seperempat z maka pernyataan yang benar adalah
Jawab:
C
Penjelasan dengan langkah-langkah:
x = 2y
y = (1/4)z
Maka, x = 2((1/4)z) = (1/2)z
Kita coba, satu-satu yaa
Coba x + y:
x + y = (1/2)z + (1/4)z = (3/4)z
Coba 2x + y
2x + y = 2(1/2)z + (1/4)z = z + (1/4)z = (5/4)z
Coba (1/2)x + y:
(1/2)x + y = (1/2)(1/2)z + (1/4)z = (1/4)z + (1/4)z = (2/4)z = (1/2)z
Berarti yang bener C.
x + y = (3/4)z
Aljabar
x = 2y
y = 1/4 z = z/4
x = 2y = 2 × z/4 = z/2
x + y
= z/2 + z/4
= (2z + z)/4
= 3z/4
Pernyataan yg benar :
x + y = 3/4 z
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