Question

identify the error the student made step 1 : 19-2k = 3k-1 +3k +3k ___ ___ step 2 : 19+k=-1 -19 -19 ___ ___ k = -20

Answer 1

We have the following equation:

19 -2k = 3k -1

+3k +3k

________________

19 +k = 6k-1

20 = 5k

k = 4

The error was because the student commit the following error:

3k + 3k = 6k