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a+b=24
a-b=6 (dieliminasi dgn cara dikurangkan)
2b=18
b=9
a+b=24
a+(9)=24
a=15
a×b=9×15=135
x-y = 6
jadi,
x= 24-y masukkan dlm persamaan x-y=6
24-y-y =6
24-2y=6
-2y=6-24
-2y=-18
y=9
lalu, masukkan lagi,
x-9=6
x=6+9
x=15
Hasil x*y = ?
15*9 = 135