Question

The work of a student to solve a set of equations is shown below:

Equation 1: m = 6 + n
Equation 2: 2m = 8 + 8n



Step 1: −2(m) = −2(6 + n)
2m = 8 + 8n

Step 2: −2m = −12 − 2n
2m = 8 + 8n

Step 3: −12 − 2n = 8 + 8n

Step 4: −20 = 10n

Step 5: n = −2


In which step did the student first make an error?
Step 2 Step 3 Step 4 Step 5

Answer 1

my guess is 3 since i don't understand it at all

Answer 2

@rishavraj

Answer 3

@BGrg007

Answer 4

i will give a medal @rishavraj

Answer 5

2 medals for 2 questions @rishavraj

Answer 6

step 3 is wrong

Answer 7

then what is it

Answer 8

@rishavraj

Answer 9

Depends, because you can't magically bring out those negative signs in Step 1 unless you're putting a negative sign on the other side of the equation as well. But like the previous guy said, its most likely Step 3, because the student didn't put (-) sign around 8+8n.