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MrRissso [65]
3 years ago
11

Anna and Belle are asked to solve −2x − 15 = 6x + 9. Identify where one of them made an error. Anna Belle −2x − 15 = 6x + 9 −2x

− 15 −6x = 6x + 9 −6x −8x − 15 = 9 −8x − 15 + 15 = 9 + 15 −8x = 24 Negative 8x over negative 8 equals 24 over negative 8 x = −3 −2x − 15 = 6x + 9 −2x − 15 + 2x = 6x + 9 + 2x −15 = 8x + 9 −15 + 9 = 8x + 9 + 9 −6 = 8x Negative 6x over 8 equals 8x over 8 Negative two-thirds
Mathematics
2 answers:
GalinKa [24]3 years ago
7 0

Answer:

<h2>Belle is wrong.</h2>

Step-by-step explanation:

The given expression is

-2x-15=6x+9

The steps Anna did are

-2x-15=6x+9\\-2x-15-6x=6x+9-6x\\-8x-15=9\\-8x-15+15=9+15\\-8x=24\\\frac{-8x}{-8}=\frac{24}{-8}  \\x=-3

If you look carefuly, you would notice that Anna didn't make any mistakes, her steps and result is correct.

Belle steps are

-2x-15=6x+9\\-2x-15+2x=6x+9+2x\\-15=8x+9\\-15+9=8x+9+9

Notice that this step is wrong, because she's not adding -9 to eliminate that term.

-6=8x, this step is also wrong, because 9 + 9 = 18.

Therefore, Belle is wrong.

Finger [1]3 years ago
5 0

Belle got it wrong when she added the 9 because it was already positive, meaning she would’ve subtracted it.

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Theleft-hand side of the equation is:
                                                             48 + 54 = 102
Now the right-hand side of the equation:
                                                                    A </span>× (8+9) = Right-hand side
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Solving for the unknown variable A,
                                                                    A × 17 = 102
Dividing by 17 on both sides,
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