4 years ago

Can someone help me plz I will make brainliest. For correct answers only

Mathematics

1 answer:

Licemer1 [7]4 years ago

4 0

Answer:

It's the 3rd one: Commutative Property of Equality.

Step-by-step explanation:

Original: 3a + 6 = 2 - 5a + 7

But then on step one, the -5a was moved around. The -5a took the position of where the +7 was located and the +7 took the position of where the - 5a was located. (Basically, they switched)

Step one: 3a + 6 = 2 + 7 -5a

<h2>(I really hope this helps.)</h2>

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$\frac{1}{a} = \frac{1}{b} + \frac{1}{c} \\ \\ \frac{1}{12} = \frac{1}{b} + \frac{1}{22} \\ \\ \frac{1}{b} = \frac{1}{12} - \frac{1}{22} \\ \\ \frac{1}{b} = \frac{11}{132} - \frac{6}{132} \\ \\ \frac{1}{b} = \frac{11 - 6}{132} \\ \\ \frac{1}{b} = \frac{5}{132} \\ \\ 5b = 132 \\ \\ b = \frac{132}{5} \\ \\ b = 26.4 \\ \\ b = 26$