exam Maths Puzzle Numerical Ability

x-y=-5
x=3y=3 couldyou please help me understand how to solve this problem?

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exam Other Question

Anton Smith is planning an expansion of a square flower garden in a city park. If each side of the original garden is increased by 4 meters, the new total area of the gardn will be 100 square meters. Find the length of each side of the original garden. (x + 1)(x + 1)

this one is the last homework problem question...thank again!