Is this a linear function?

Yes

Step-by-step explanation:

We will finde linear line trought two point and chak do the other two point hold in equation. If do, that is linear function.

Line trough two first points is:

(y-1)/(-2-1)=(x-3)/(-1-3)

Y-1=-3(x-3)/(-4)

See do other two points are in this equation ok.

X=7 y=4

4-1=3

-3*4/(-4)=3 it is ok

X=11 y=7

7-1=6

-3(11-3)/(-4)=3*8/4=6

It is ok too, so

this is linear function.

$35.59 in pounds

step-by-step explanation:

b.-4 units

all you   do is count how many times you move