Question

Slope of the line (15,6) and (30,4)

Answer 1

Here let (15,6)=(x1,y1)
(30,4)=(x2,y2)
Now using the formula:
m=y2-y1/x2-X11
m=4-6/30-15
m=-2/15

Answer 2

the line (15,6) and (30,4)

m=
`(4 - 6)/(30 - 15)`

=
`( - 2)/(15)`

is a required slope.