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a+b=41
a-b=19
------------ - (lakukan eliminasi)
2b=22
b=11
substitusi b=11 ke salah satu persamaan.
misal, a+b=4, maka, a+11=41
a=30
jadi, hasil kali kedua bilangan --> a x b = 11 x 30
= 330
x+y=41
x-y=19
2x=60
x=60/2
x=30
y=30-19
y=11
hasil kali
30 x 11
330