exam Maths Puzzle Numerical Ability

please help I am having trouble with this problem.

x + y = 4
-x +y =2

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exam Other Question

You are considering the purchase of a $1,000 par value bond. The bond is currently selling for $500 and (very un-typically) pays $20 quarterly. It matures in 20 years.

a. What please help solve

find the product

( (5x+1)+6y) )^2