write and equation for the following transformation of y=x' a vertical stretch by a factor of 4

Question

anonymous · Answer

it would be y-4=x'

anonymous · Answer

how did you get that though? its a workpad. im confused.

anonymous · Answer

okay let me clarify . have you got question ?

anonymous · Answer

i just am not sure how you got that. if its a vertical stretch does that mean you just put a subtraction sign?

anonymous · Answer

nope  i got my interpretation of question its like this 
 you got graph of y=x' 

and now you wanna stretch that graph in vertical direction by 4 units 

here we have a basic rule  if you wanna shift the graph of y=f(x) by 'a' units 

what you do is subtract a from y 

so your equation of new shifted graph is y-a=f(x) 

now you know why i subtracted 4 from y

anonymous · Answer

oh ok that makes more since. thank you for your help :)

anonymous · Answer

you are most welcome !! :)