Answer:
The correct option is A) [tex]x=\frac{y+9+7z}{7}[/tex]
Step-by-step explanation:
Consider the provided equation.
[tex]y=7x-7z-9[/tex]
We need to solve the provided equation for x.
Add 9 both side.
[tex]y+9=7x-7z[/tex]
Now add 7z to both side.
[tex]y+9+7z=7x-7z+7z[/tex]
[tex]y+9+7z=7x[/tex]
Divide both sides by 7.
[tex]\frac{7x}{7}=\frac{y+9+7z}{7}[/tex]
[tex]x=\frac{y+9+7z}{7}[/tex]
Hence, the correct option is A) [tex]x=\frac{y+9+7z}{7}[/tex]
