exam Maths Puzzle Numerical Ability

Monohybrid crosses with incomplete dominance
When Mexican Hairless dogs are crossed with normally-haired dogs, about half the pups are hairless and half have hair. When, however,

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Could you please help me out with this problem. Math is so hard and confusing to me.
4x-12y=5
-x+3y=-1
1. A customer wants to make a teepee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the teepee, and he wants the teepee to be 12 feet across and 8 feet tall. How long should the PVC plumbing pipe be?