book Maths Puzzle Numerical Ability

When using substitution...
x+5y=4
3x+15y=-1

My answer was (-1,-1) Is that right?
Thanks

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book Other Question

Write in simplified radical form by rationalizing the denominator.

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-5�</font>3 + 8</PRE> What property of the square root is essential in order for you to solve any radical equation involving a square root?