Math
posted by Jenny on .
I still can't understand this one.In class we got 42 but I got 48 and when I check it none of them match up
4/8y21=3 What is y?

Assuming you copied the problem correctly, your answer is correct.
4/8y21=3
4/8y = 3 + 21
4/8y = 24
y = 24 / (4/8)
y = 24 * (8/4)
y = 192/4 = 48
Proof:
1/2 (48)  21 = 3
24  21 = 3 
If you mean
(4/8)y  21 = 3
then y=48 as you got.
If the question were
(4/8)y21=0
then y=42 
Thank you!

You're welcome.