Answer:
Slope = -1
Step-by-step explanation:

8x+6-5x=1
3x+6=1
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Here we go ~
As we can see in the figure, lines m and n are parallel to each other. so we can apply Angle pair properties ~
So,

[ they form corresponding angle pair ]
and it's given that :

therefore, by using above information. we can conclude that :

I don't know go to the photo math or others xxx2