2X - 3Y = 40
X + 2Y =37
A. Nilai X
B. Nilai Y
C. Berapakah 2X + 4Y =........?
X + 2Y =37
A. Nilai X
B. Nilai Y
C. Berapakah 2X + 4Y =........?
Jawaban:
a. X = 71
b. Y = 34
c. 2X + 4Y = 278
Penjelasan dengan langkah-langkah:
b. 2x - 3y = 40 (x1)
2x + 4y = 74 (x2)
___________ -
-y = -34
y = 34
a. 2x - 3y = 40
2x - 3(34) = 40
2x - 102 = 40
2x = 102 + 40
2x = 142
x = 71
c. 2x + 4y =
= 2(71) + 4(34)
= 142 + 136
= 278
