Answer:
28
Step-by-step explanation:
So we can represent the x-y relationship with a fraction, 21/9(y/x)
Let’s take the unknown y number as “y”
So y/12=21/9(since they are proportional they equal each other)
1)cross multiply:
9y=12*21
9y=252
Divide both sides by 9
Y=28
Hope this helps!
