Answers: [tex]x<-8[/tex]
1. Switch sides
[tex]-9x+8>80[/tex]
2. Subtract by 8 from both sides of equation.
[tex]-9x+8-8>80-8[/tex]
3. Simplify.
[tex]-9x>72[/tex]
4. Multiply by -1 from both sides of equation. (it's should be the reverse inequality).
[tex](-9x)(-1)<72(-1)[/tex]
5. Simplify.
[tex]9x<-72[/tex]
6. Then you had to divide by 9 from both sides of equation.
[tex]\frac{9x}{9}< \frac{-72}{9}[/tex]
7. Simplify.
[tex]\frac{9x}{9}=x[/tex]
8. Divide by the numbers.
[tex]\frac{9}{9}=1[/tex]
[tex]=x[/tex]
[tex]\frac{-72}{9}=-8[/tex]
9. Divide by the numbers.
[tex]\frac{72}{9}=8[/tex]
[tex]=-8[/tex]
[tex]x<-8[/tex]
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