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

Equation 1: m = 8 + 2n
Equation 2: 4m = 4 + 4n

Step 1:

−4(m) =

−4(8 + 2n)

4m =

4 + 4n

Step 2:

−4m =

−32 − 8n

4m =

4 + 4n

Step 3:

−4m + 4m =

−32 − 8n + 4n

Step 4:

0 =

−32 − 4n

Step 5:

n =

− 8

In which step did the student first make an error?

Question

The work of a student to solve a set of equations is shown below:

Equation 1: m = 8 + 2n
Equation 2: 4m = 4 + 4n





Step 1: 

−4(m) = 

−4(8 + 2n)



 

4m = 

4 + 4n



 



Step 2: 

−4m = 

−32 − 8n



 

4m = 

4 + 4n



 



Step 3: 

−4m + 4m = 

−32 − 8n + 4n



 



Step 4: 

0 = 

−32 − 4n



 



Step 5: 

n = 

− 8



In which step did the student first make an error?

anonymous · Answer

@olivier008 can you help me with this one please?

anonymous · Answer

looks like step 3 he has forgotton to compute the +4 which would result in -28

anonymous · Answer

thatnk you agian!:)

anonymous · Answer

thank*