exam Maths Puzzle Numerical Ability

Find the slope of the line.

The graph shows y= (0,8)
x= (3,-7)

The slope of the line is m= -5

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exam Other Question

I graphed this inequalitity but it does not look right...
y>x^2+x-6
y seniors performnd the same experiment on three groups of subjects and obtained mean scores of 84, 69, and 76. The groups consisted of 13, 31, and 27 subjects respectivly. What is the overall mean for all subjects to 2 decimal places?