What is the slope of the line that contains the points (-1,8) and (5,-4)? a) 2 b)-1/2 c)-2 d)1/2

The water company charges a residential customer $41 for the first 3,000 gallons of water used and $1 for every 200 gallons used over 3000 gallons. if the water bill was $58 how many gallons of water were usedanswersa 3400 gallonsb 6000 gallonsc 6400 gallons d 7000 gallons