Tim's error was in the step: "X = -8, (-8) + 7 = -1".
The correct step should be: "X = -8, (-8) + 7 = -1 + 7 = 6".
Tim incorrectly added 7 to -8, resulting in -1 instead of the correct answer of 6.
Tim solved the question: X + 7 = -15
His steps were as follows: X + 7 = -15, add seven to both sides, X = -8, (-8) + 7 = -1
When he checked back, his solution didn’t work
What was his error?
1 answer