book Maths Puzzle Numerical Ability

If the sides of a square are decreased by 3 cm, the area is decreased by 81 cm^2. What were the dimensions of the original square?

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Add or subtract as indicated. Write all answers in lowest terms.

1. 8 / t + 7 / 3t

2. 2 / 4 - x + 5 / x - 4 I need to find the intercept point of y=3x+8 and 4x+2y=6. If you can find the answer, would you explain it to me? I also have a few more to do and I need to understand how to do it.