need help fixing an answer

Question

0

665

1

I'm studying for a test and some of my answers are incorrect,

I want to know how I can fix them, to get a right answer

(/ equals divide)

so

3k-6/3= 5

I did this

3k = 5 + 6 x 3

3k = 11 x 3

3k = 33

k = 33/3 or 11

the answer is k=7, what did I do wrong? {nl}

Guest Apr 3, 2016

edited by Guest Apr 3, 2016
edited by Guest Apr 3, 2016
edited by Guest Apr 3, 2016
edited by Guest Apr 3, 2016

Alan · Answer 1 · 2016-04-03T07:48:49

You need to use brackets to avoid ambiguity.

(3k - 6)/3 = 5

Multiply both sides by 3

3k - 6 = 3*5 or 3k - 6 = 15

Add 6 to both sides

3k = 15 + 6 or 3k = 21

Divide both sides by 3

k = 21/3 or k = 7

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