exam Maths Puzzle Numerical Ability

The constant rate of change of a linear function is also the slope why?

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exam Other Question

What is the answer to:
7y-(6y+3)=12
If I need to find the average of these numbers: 18+(-17)+(-22)+(16)+(0) do I count the 0 in my number of terms?? In other words, do I divide the total (5) by 4 or 5?
thanks.
Kim