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anonymous
 one year ago
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 twothirds
anonymous
 one year ago
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 twothirds

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.01 Add 2x to both sides −15=6x+9+2x 2 Simplify 6x+9+2x to 8x+9 −15=8x+9 3 Subtract 9 from both sides −15−9=8x 4 Simplify −15−9 to −24 −24=8x 5 Divide both sides by 8 −248=x 6 Simplify 248 to 3 −3=x 7 Switch sides x=−3
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