exam Maths Puzzle Numerical Ability

Find the slope-intercept equation of the line that passes through the point (1,5) and has slope -1

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exam Other Question

how do i show that rank(A + In) + rank (A - In) = n where A is an involution matrix and is an element of Mn(C). Mn(C) is the set of all square matrices with C the set of complex nu Please find:

the distance (-2,3,1) and (4,5,-1)

and

midpoint (-2,3,1) and (4,5,-1)

Thanks