exam Maths Puzzle Numerical Ability

Solve the following systems. Write answers as an ordered pair.

y-x =5

x+y = -1

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exam Other Question

I need help finding the answer to this question.
The length of one of the equal legs of an isosceles triangle is 8 cm less than 4 times the length of the base. If the perimeter is 29 cm, find the length of one of the equal legs. How do you solve this problem?

(SQUARE ROOT 2)^7