find the slope between the points A(a+b,4m-n) and B(a-b,m+2n)

if slope = Y2-Y1

X2-X1

explain, please

(a + b, 4m - n) = ( X2, Y2)

(a - b, m + 2n) = (X1, Y1)

So.....the slope is

[ (4m - n) - (m + 2n)]

__________________ simplify

[ (a + b) - (a - b) ]

[ 3m -3n ]

________

2b

3 [ m - n]

_______

2 b