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?

Answer 1

He is solving this my using elimination

Answer 2

On step 2 is where he made his mistake because you see that he has to add up the two equations to cancel each other out but he forgot to add 4 to the -32.

Answer 3

Well, on step 3 because that's where it actually shows his mistake.

Answer 4

you were right is the third one

Answer 5

Glad to help =)