Yes it is. If you convert it to a decimal it will be .8 or .80 (Same thing)
Answer:
x + 4y = 4
4y = 4 - x
multiply both sides by 1/4
y = 1/4( 4- x)
y = 1- 1/4x
What you can do is simply switch the fractions like so, 3/4 and 12/16 then simplify 12/16 and you get 3/4 so your answer is yes, it is proportional.
B !!!!!!!!!!!!!!!!!!!!!!!!!
The greatest common factor is 8x:
8x² - 24xy + 16x = 8x ( x - 3y + 2)