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x + y = 37
x - y = 7__ -
2y = 30
y = 30/2
y = 15
x + y = 37
x + 15 = 37
x = 37 - 15
x = 22
x * y = 22 * 15
= 330
a - b = 7
---------------- -
2 b = 30
b = 15
a + b = 37
a + 15 = 37
a = 37 - 15 = 22
Hasil kali = a x b = 15 x 22 = 330