book Maths Puzzle Numerical Ability

5-m
____
m-5

I put -1 is this correct???

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show that,if a and b are not both zero , then the eqaution ax+by+c=0 is the equation of a line and conversely ,every line has an equation of that form. Walt and Gail left a stable for a ride to a mountain lookout. On the way up, they averaged 3 mi/h. On the way back along the same trail, they averaged 5 1/4 mi/h, and the return tr