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x - 4y = -14 ................. (b)
maka
2x + 5y = 11 |x1| ⇒ 2x + 5y = 11
x - 4y = -14 |x2| ⇒ 2x - 8y = -28 -
13y = 39
⇒ y = 39/13
⇒ y = 3
⇒ q = 3
Sehingga
x - 4y = -14
⇒ x - 4(3) = -14
⇒ x - 12 = -14
⇒ x = -14 + 12
⇒ x = -2
⇒ p = -2
Jadi,
pq = (-2)(3)
pq = -6
Terimakasih semoga membantu