exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

I need to solve the following systems by substitution:

4x - 12y = 5
-x + 3y = -1

Thanks,
Lyn

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Using a new lawn mower, Abby can mow the lawn in 2 hours. Her sister Carla uses an older mower and takes 3 huors to mow the same lawn. How long will it take them if they work together? Please tell me how you answer it. That would be awesome. I can sure use some help on this please.
Geometry
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