exam Maths Puzzle Numerical Ability

Determine the slope of each line or linear function from the given information:

f(x)=0.5x+8

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exam Other Question

Find the slope of the line.

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

The slope of the line is m= -5
please help with this last one.

Solve the quadratic equation by factoring

2x^2 = 19x + 33

thanks