Question

A student’s work is shown below.

Answer 1

Answer:  Choice C

The student solved the problem incorrectly. The student should add 12.7 to both sides of the equation to isolate the variable, y.

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Explanation:

We add 12.7 to both sides to undo the "minus 12.7"

We apply the inverse operation to whatever is happening to x.

As another example, solving x-2 = 10 leads to x = 12 after adding 2 to both sides to undo the "minus 2".

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The student's steps should look like this

y - 12.7 = 32.75

y-12.7+12.7 = 32.75+12.7

y = 45.45

Notice on the left side of the second step, we have the -12.7+12.7 become 0 and go away.

Answer 2

Answer:

the correct answer is

D the student solved the problem. correctly