Tim's error was in his final step.
The correct steps to solve the equation X + 7 = -15 would be:
1. Subtract 7 from both sides of the equation:
X + 7 - 7 = -15 - 7
X = -22
Therefore, the correct solution to the equation is X = -22.
In terms of feedback, Tim's mistake occurred when he incorrectly subtracted 7 from -8 instead of following the correct steps of the equation. It is important to double-check all calculations to avoid errors. Additionally, encourage Tim to carefully review his work when checking solutions to equations, as this can help in identifying and correcting mistakes.
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?
“Grade” his paper and provide helpful feedback below. You can either include the steps to get the correct answer or describe what he did wrong
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