book Maths Puzzle Numerical Ability

I need help with my math homework the instructions say

The variables x and y vary directly. Use the given values to write an equation that relates x and y.

x=6 y=18

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book Other Question

i need help with these problems as well please.

10 divided by w-8 subtracted from 12 over 8-w the answer i got was 22 divided by w-8????
Write 3 4/5 as an improper fraction.

Write the expression -3(-5) in words.

What is the quotient of 13 and -6?

Find the product of 800 and -8.

Find the product of 100 and -10.