exam Maths Puzzle Numerical Ability

Suppose $500 is invested at 6% annual inerest compounded twice a year. When will the investment be worth $1000?

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Please assist me with the following question....thank you
Nancy Tai has recently opened a revolving charge account with MasterCard. Her credit limit is $1000, but she has not char solve each systems by substitution:

4x-12y=5
-x+ 3y=-1