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aleksklad [387]
4 years ago
11

What is 3x - y = 17 x + y = -5

Mathematics
1 answer:
Virty [35]4 years ago
3 0

Answer:

{x,y}={6,1}

Step-by-step explanation:

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olga2289 [7]

\sqrt{a}=b\iff b^2=a\ for\ a\geq0\ \wedge\ b\geq0\\---------------------\\\\Method\ \#1:\\\\\sqrt{9\cdot4}=\sqrt{36}=6\ because\ 6^2=36\\\\d)\ \sqrt9\cdot\sqrt4=3\cdot2=6\\\\\sqrt9=3\ because\ 3^2=9;\ \sqrt4=2\ because\ 2^2=4\\\\Answer:\ \boxed{d)\ \sqrt9\cdot\sqrt4}\\\\Method\ \#2:\\\\\text{use}\ \sqrt{a\cdot b}=\sqrt{a}\cdot\sqrt{b}\\\\\sqrt{9\cdot4}=\sqrt9\cdot\sqrt4\\\\\text{Therefore your answer is}\ \boxed{d)}

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