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2px² + 2qxy + 3pxy + 3qy² = rx² + 23xy + 12y²
2px² + (3p + 2q) xy + 3qy² = rx² + 23xy + 12y²
3q = 12
q = 4
3p + 2q = 23
3p + 2.4 = 23
3p = 23-8
3p = 15
p = 15 : 3 = 5
r = 2p
= 2.5
= 10
nilai r adalah 10