Answer:
Yes
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.