Answer:
y = -1/4x + 3
Explanation:
you got to do the inverse, so like this
y = 4x > y = -1/4x
then you do take the coordinates (4,2) and put them into place like this:
y - 2 = -1/4(x - 4) > y - 2 = -1/4x +1 (four times -1/4 = 1)
then add the -2 on both sides
y = -1/4 + 3
:)