Answer :

the slope always comes before the x so the slope is -6. the y-intercept is what is being added or subtracted from the slope so the y-intercept is 4
so it is in y=mx+b form where m is the slope so

slope is -6

the y intercept is where x=0 so set x to zero and get

y=-6(0)+4
y=04
y=4

the y intercept is 4