exam Maths Puzzle Numerical Ability

Dustin is 11 years younger than Elias. In two years, Dustin will be half as old as Elias. How old is Dustin?

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Hello,
I need help with this problem.
g(x)=5^x

thanks so much. Determine which two equations represent parallel lines.
(a) y = 9x – 7 (b) y = –9x + 7 (c) y = 9x + 3 (d) y = -1/9x – 7

I have no idea even how to begin to figure this out.