The answer would be -3/2
A reciprocal is the inverse of a number.
When using this in fractions just switch the numerator and denominator. This is done by dividing the fraction by one, but in the case of a negative fraction you would divide by negative 1.
4.65
13 ÷ 20 is 0.65, just add the 4
slope = 
using the points (1, 2 ) and (- 2, 0 ) then slope m
m =
=
= 