exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (7, 10) and (8, -8).

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exam Other Question

Wilma drove at an average speed of 50 mi/h from her home in City A to visit her sister in City B. She stayed in City B 10 hours, and on the trip back averaged 45 mi/h. She returned home 40 hours after leaving. How many miles is City A from City B How do I solve the equation and find the property I use at each step to simplify the equation
4x + 11 = (5x + 34)/2