The answer to your question is -3 !!
Subtract 8 from 54. ( -3x = 46 ) Divide -3 from 46. Your answer should be about -15.3
Comparing x-1 with x-a then x=1
1^3+p*1^2-1-2=0
1+2p-3=0
2p=3-1
P=2/2
P=1
:.p=1
Answer:

From this, you can tell it's in slope-intercept form, has a slope of -1/2, and a y-intercept of -4.
I've included a picture of what this equation looks like.