Question

X-y = 15
y = -x + 5
berapa nilai x pangkat tiga dan y pangkat tiga

Answer 1

X -y = 15 -------> x = 15 +y
y = -x +5

y = -(15 +y) +5
y = -15 -y +5
y +y = -15 +5
2y = -10
y = -10/2
y = -5

x = 15 +y
x = 15 +(-5)
x  = 10

maka,
x³ = (-5)³
   = -125
y³ = 10³
     = 1000

Itu jawabannya.