To solve this problem you must apply the proccedure shown below:
 1. You must apply the formula for calculate the slope of a line, which is: 

 2. Where:
 y2=-1
 y1=-7
 x2=8
 x1=0
 3. Substitute the values into the formula shown above. Therefore, you obtain:
 m=3/4
 Therefore,
 the answer is: The slope is 3/4.