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SMK Teknologi dan Rekayasa

Soal 29 Sistem Persamaan Linear Dua Variabel


Nilai\ \ x+3y\ \ yang\ memenuhi\ sistem\ persamaan\\4x+5y=6\ \ dan\ \ 2x-4y=-10\ \ adalah\ ....\\a.\ \ 1\ \ \ \ \ \ \ \ \ \ \ \ b.\ 1\ \ \ \ \ \ \ \ \ \ \ \ c.\ 2\ \ \ \ \ \ \ \ \ \ \ \ d.\ 3\ \ \ \ \ \ \ \ \ \ \ \ e.\ 5
Jawaban: e

\left.\begin{matrix} 4x+5y=6\ \\ 2x-4y=-10\ \end{matrix}\right|\begin{matrix} \ \times 4\\ \ \times 5 \end{matrix}
\frac{\begin{matrix} 16x+20y=24\\ 10x-20y=-50 \end{matrix}}{}\ +\\26x\ \ \ \ \ \ \ \ =-26\\x\ \ \ \ \ \ \ \ \ \ \ =-1

\begin{array}{rcl}4(-1)+5y&=&6\\-4+5y&=&6\\5y&=&10\\y&=&2\end{array}

x+3y=-1+3(2)=-1+6=5

About Kalakay

Guru Matematika SMK

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3 thoughts on “Soal 29 Sistem Persamaan Linear Dua Variabel

  1. pgen tau ja g2 ttg cont0h sistem pertidaksamaan linier dua variabel

    Posted by nisfha | 19 November 2012, 8:39 PM

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  1. Ping-balik: Soal 29 Sistem Persamaan Linear Dua Variabel | adamtitohadiansyah - 4 Desember 2012

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