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2. (2x +3y) (px +qy) = rx² +23xy +12y²
2px² +2qxy +3pxy +3qy² = rx² +23xy +12y²
r = 2p
2q +3p = 23
3q = 12
> 3q = 12
q = 4
> 2q +3p = 23
2(4) +3p = 23
8 +3p = 23
3p = 15
p = 5
> r = 2p
r = 2(5)
r = 10
Jadi, nilai r pada persamaan bentuk Aljabar tersebut adalah 10.