Question

The work of a student to solve the equation 2(5y − 2) = 12 + 6y is shown below:

Step 1: 2(5y − 2) = 12 + 6y
Step 2: 7y − 4 = 12 + 6y
Step 3: y − 4 = 10
Step 4: y = 14
Step 5: y = 7

In which step did the student first make an error and what is the correct step?

Step 2: 7y − 4 = 6 + 3y
Step 2: 10y − 4 = 12 + 6y
Step 3: 5y − 2 = 2(10 + 3y)
Step 3: 2(5y − 2) = 10 + 3y

Answer 1

how do you expand 2(5y-2)?

Answer 2

2 x 5y + 2 x (-2)

Answer 3

what is 2 x 5y?

Answer 4

step 2

Answer 5

which one?

Answer 6

Let her figure it out

Answer 7

uggghhh

Answer 8

figure it out by distributing the equation!

Answer 9

ok thanks i guess.

Answer 10

is it b?