book Maths Puzzle Numerical Ability

Evaluate (assume x is not equal to 0)

-4x

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Please help:

I have to find the center and the length of a radius of the circle:

X^2+Y^2-2x-8y+8=0

Thanks, Find the equation of the line that passes through points (7,-2) and (5,-1)
Write the equation of the line in slope-intercept form.

I know the the slope intercept for is y = mx +b