book Maths Puzzle Numerical Ability

Complete the ordered pair (0,?) for the equation:
2x+4y=10

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book Other Question

If an annual rate of 7.5% in simple interest is charged on a loan of $290 and no payments are made for 9 months, to the nearest whole cent how much is owed? Find two negative numbers such that the square of their sum is 20 more than the square of their difference, and the difference of their squares is 24.

I have an upcoming mathletes compitition, and this problem has me stumpted.