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Pertama = x
Kedua = y
x + y = 23
x-y = 7
y =7+x
(7+x)+x = 23
7+2x = 23
2x = 23-7
2x = 16
x= 8
y = 7+x
y = 7+8
y = 15
15 dan 8
kali = 15 . 8
= 120
a-b= 7 => a = 7 +b
a + b = 23
7 +b+b = 23
2b = 16
b = 8
a+b = 23
a + 8 = 23
a=15
a x b = 15 x 8 =120