M= -1/3

b=4

y=

I need to find how to do the equation

y= -1/3x + 4

Step-by-step explanation:

m in this case is (-1/3)

and b is (4)

knowing that you can just plug them into the equation (y=mx+b)

9514 1404 393

  k = 2

Step-by-step explanation:

Find a coordinate of a point and its image. k is the ratio of those.

Here, it is easy to use the y-coordinate of J and J'.

  Jy = -1

  J'y = -2

k = J'y/Jy = -2/-1 = 2

The scale factor k is 2.