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kelereng kakak = y = 2x + 5
nah, jika jumlah kelereng mereka = 35. penyelesaian sebagai berikut
x + y = 35
x + 2x + 5 = 35
3x + 5 = 35
3x = 35-5
3x = 30
x = 30/3
x = 10
kakak = y = 2x+5 = 2x10 + 5 = 20 + 5 = 25 buah
adik = x = 10 buah
a+b= 35
maka
(2b+5)+b = 35
3b=35-5
3b = 30
b= 10
a+b= 35
a+10 = 35
a= 35-10
a= 25