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sosa1k18
sosa1k18
11.11.2019 • 
Mathematics

Emory used these steps to solve the equation.

x + 7 = 3x + (−5).

1. add 1 negative x-tile to both sides and create zero pairs.

2. add 7 negative unit tiles to both sides and create zero pairs.

3. divide the 12 negative unit tiles evenly among the 2 x-tiles.

4. the solution is x = −6.

where did emory make an error?
in step 1, he should have added 3 negative x-tiles to both sides.
in step 2, he should have added 5 positive unit tiles to both sides.
in step 3, he did not divide the tiles evenly.
in step 4, he should have found the solution x = 3.

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