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dan Bilangan kedua dimisalkan Y
x + y = 16
x - y = 4
Jika di eliminasi :
x+y = 16
x - y = 4 +
2x = 20
x = 20/2
x = 10
Sekarang disubsitusikan :
x + y = 16
10 + y =16
y = 16-10
y = 6
Selisih kuadrat bilangan
10² - 6²
100 - 36
=64
Semoga membantu dan maaf kalau salah :)