연립일차방정식

For the following exercises, solve each system by substitution.

$\begin{array}{c}2x+4y=-3.8 \\ 9x-5y=1.3\end{array}$

For the following exercises, solve each system by substitution.

$\begin{array}{c}\, x-0.2y=1 \\ -10x+2y=5\end{array}$

For the following exercises, solve each system by substitution.

$\begin{array}{c}\, 3x+5y=9 \\ 30x+50y=-90\end{array}$

For the following exercises, solve each system by substitution.

$\begin{array}{c}\,-3x+y=2 \\ 12x-4y=-8\end{array}$

For the following exercises, solve each system by substitution.

$\begin{array}{c}\frac{1}{2}x+\frac{1}{3}y=16 \\ \frac{1}{6}x+\frac{1}{4}y=9\end{array}$

For the following exercises, solve each system by substitution.

$\begin{array}{c}-\frac{1}{4}x+\frac{3}{2}y=11 \\ -\frac{1}{8}x+\frac{1}{3}y=3\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}-2x+5y=-42 \\ \,7x+2y=30\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}6x-5y=-34 \\ 2x+6y=4\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}\, 5x-y=-2.6 \\ -4x-6y=1.4\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}7x-2y=3 \\ 4x+5y=3.25\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}\,-x+2y=-1 \\ 5x-10y=6\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}\, 7x+6y=2 \\ -28x-24y=-8\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}\frac{5}{6}x+\frac{1}{4}y=0 \\ \frac{1}{8}x-\frac{1}{2}y=-\frac{43}{120}\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}\,\frac{1}{3}x+\frac{1}{9}y=\frac{2}{9} \\ -\frac{1}{2}x+\frac{4}{5}y=-\frac{1}{3}\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c} \\ \begin{array}{c}-0.2x+0.4y=0.6 \\ \, x-2y=-3\end{array}\end{array}$

For the following exercises, solve each system by addition.

$\begin{array}{c}\begin{array}{c} \\ -0.1x+0.2y=0.6\end{array} \\ \,5x-10y=1\end{array}$

For the following exercises, solve each system by any method.

$\begin{array}{c}5x+9y=16 \\ \, x+2y=4\end{array}$

For the following exercises, solve each system by any method.

$\begin{array}{c}6x-8y=-0.6 \\ 3x+2y=0.9\end{array}$

For the following exercises, solve each system by any method.

$\begin{array}{c}5x-2y=2.25 \\ 7x-4y=3\end{array}$

For the following exercises, solve each system by any method.

$\begin{array}{c}\,x-\frac{5}{12}y=-\frac{55}{12} \\ -6x+\frac{5}{2}y=\frac{55}{2}\end{array}$