plz help me guys... :(

Answer:
(-1,8)
Step-by-step explanation:
The easiest method would be using substitution:
[tex]\left \{ {{-10x+3y=34} \atop {y = -8x}} \right.[/tex]
Substitute the second equation into the first one:
[tex]-10x + 3(-8x)=34[/tex]
[tex]-10x+-24x = 34[/tex]
[tex]-34x = 34[/tex]
[tex]x = -1[/tex]
Use the x-value to get the y-value:
[tex]y = -8*-1[/tex]
[tex]y = 8[/tex]
Final answer:
(-1,8)