exam Maths Puzzle Numerical Ability

slove algebraically log5 + log (4-2x)= log(x-1)

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a) what is the slpe of any line that is parallel to the line through (-3,-4) and (5,-1)

b) what is the slope of a line that is perpendicular to the line through (5,4) and (5,-2) Subtract the complex numbers: (3 + 5i) - (1-7i).