Answer:
![\boxed{\tt m=0}](https://img.qammunity.org/2021/formulas/mathematics/college/qmaetlriaqyd3smful2l57iqyxkcf8g86u.png)
Explanation:
The slope formula is:
![m=(y_(2) -y_(1))/(x_(2)-x_(1))](https://img.qammunity.org/2021/formulas/mathematics/high-school/8ueq0bgq1ji79jlp797o0bieqhpnb3usfg.png)
where (x₁, y₁) and (x₂,y₂) are the points on the line.
The points given are (-2,8) and (-22,8). Therefore,
![x_(1)=-2\\y_(1)=8\\x_2=-22\\y_2=8](https://img.qammunity.org/2021/formulas/mathematics/college/agaxemgzrgrvsgx2mth2lh5xcd8bc7d78a.png)
Substitute the values into the formula.
![m=(8-8)/(-22--2)](https://img.qammunity.org/2021/formulas/mathematics/college/3nzyalou1085qk28o52pzesu92c2v7dsii.png)
Solve the numerator. Subtract 8 from 8.
![m=(0)/(-22+2)](https://img.qammunity.org/2021/formulas/mathematics/college/laxsoqmjcnrb12h7aecsldiutve8q87l41.png)
Zero divided by any number is zero, so we automatically know the slope is zero.
![m=0](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ejo7v6f8apqzf3aovi8oslh98eb9n0jrik.png)
The slope of the line is 0