Jawab:
x + y + z = 18
y X z = y² + y → y z = y (y + 1)
z = y + 1
.
x + y + z= 18
x + y + y + 1 = 18
x + 2y + 1 = 18
x + 2y = 18 - 1
x + 2y = 17
nilai (x + 2y) /2 = 17/2 = 8,5
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Verified answer
Jawab:
x + y + z = 18
y X z = y² + y → y z = y (y + 1)
z = y + 1
.
x + y + z= 18
x + y + y + 1 = 18
x + 2y + 1 = 18
x + 2y = 18 - 1
x + 2y = 17
nilai (x + 2y) /2 = 17/2 = 8,5