Answer:
[tex]answer 2.) \: x = \frac{89}{38} y - \frac{69}{19} [/tex]
Step-by-step explanation:
Explanation number 2.)
[tex]x = - \frac{7}{10} y - \frac{1}{5} \\ \\ 4( - \frac{7}{10} y - \frac{1}{5} ) - y = 13 \\ \\ y = - \frac{69}{19} \\ \\ x = - \frac{7}{10} x( - \frac{69}{19} ) - \frac{1}{5} \\ \\ x = \frac{483}{190} - \frac{1}{5} \\ \\ x = \frac{89}{3} [/tex]
[tex]answer3.) \: x = - \frac{15}{2} y = \frac{65}{4} [/tex]
explanation number 3.
[tex](x = - \frac{2}{3} y + \frac{10}{3} \\ ( - 8x - 4y = - 5 \\ \\ - 8( - \frac{3}{2} y + \frac{10}{3} ) - 4y = - 5 \\ \\ y = \frac{65}{4} \\ \\ x = - \frac{2}{3} \times \frac{65}{4} + \frac{10}{3} \\ \\ \times = \frac{65}{4} \\ \\ x = - \frac{2}{3} \times \frac{65}{4} + \frac{10}{3} \\ \\ x = - \frac{65}{6} + \frac{10}{3} \\ \\ x = - \frac{15}{2} \\ \\ x = - \frac{12}{2} y = \frac{65}{4} [/tex]
