Vgln. eerste graad (reeks 1)

Bepaal de waarde van x.

\(-11x-1=8\)

\(\begin{align} & -11x \color{red}{-1}& = &8 \\\Leftrightarrow & -11x \color{red}{-1}\color{blue}{+1} & = &8\color{blue}{+1} \\\Leftrightarrow &-11x & = &9\\\Leftrightarrow & \color{red}{-11}x & = &9\\\Leftrightarrow & \frac{\color{red}{-11}x}{ \color{blue}-11} & = & \frac{9}{-11} \\\Leftrightarrow & \color{green}{ x = \frac{-9}{11} } & & \\ & V = \left\{ \frac{-9}{11} \right\} & \\\end{align}\)