book Maths Puzzle Numerical Ability

What property of the square root is essential in order for you to solve any radical equation involving a square root?

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book Other Question

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

My answer was (-1,-1) Is that right?
Thanks Hello!
It's me again..sorry to be suck a rock. Could someone help me undestand how to find the LCD, then convert to a rational expression, using the LCD as the denominator? I don'