Jika dua garis yang memenuhi persamaan matriks ![\left[\begin{array}{cc}a&2&1&b\end{array}\right] \left[\begin{array}{c}x&y\end{array}\right] = \left[\begin{array}{c}16&-18\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7Da%262%261%26b%5Cend%7Barray%7D%5Cright%5D+%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7Dx%26y%5Cend%7Barray%7D%5Cright%5D+%3D+%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D16%26-18%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{cc}a&2&1&b\end{array}\right] \left[\begin{array}{c}x&y\end{array}\right] = \left[\begin{array}{c}16&-18\end{array}\right]")
sejajar, maka nilai dari ab adalah
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terdapat persamaan:
2y = -ax + 16
by = -x - 18
sejajar, maka
jadi , ab = 2 (perkalian silang)
moga membantu ...