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Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Which of the following is another way to express the difference between -5 and 8?

Amotorboat maintained a constant speed of 12 miles per hour relative to the water in going 45 miles upstream and then returning. the total time for the trip was 8.0 hours. use this information to find the speed of the current.