3.
y vaires directly as x means
y=kx
where k is a constant
given
y=8 and x=-6
8=-6k
divide both sides by -6
8/-6=k
-4/3=k
so
y=-1.33x
2nd option
4.
y=kx
y=mx+b
k would be the slope or rise/run
it rises 1 and travels 4 from (0,0) to (1,4)
slope or constant of variation is 1/4