Answer:
y=75
Explanation:
Alright first off you want to be able to find the ratio to this to be able to find that Y you are looking for.
If you simplify y=45 and x=3 both by 3 you will get:
y=15 and x=1
now, lets turn that X to a 5 just like the other x which equals 5 as well...
but here's the catch when you times our X by 5 to equal 5 we are also going to times our Y by 5 to and do you know what 15 times 5 is it's 75.
now that we know that let's type that out to make it clear:
x=5 and y=75
you see the pattern now ;)