Question

Step 1. 3(3x − 4) = 8 + 2x + 5 Step 2. 6x − 7 = 13 + 2x Step 3. 6x − 2x = 13 + 7 Step 4. 4x = 20 Step 5. x = 5 In which step did the student first make an error and what is the correct step?

a.Step 2, 9x − 12 = 13 + 2x
b.Step 2, 9x − 4 = 2(6 + x + 3)
c.Step 3, 6x + 2x = 13 + 7
d.Step 3, 6x − 2x = 13 − 7

Answer 1

First, here is the correct step!
3(3x-4)=8+2x+5
9x-12=2x+13
7x=25
x=25/7 or 3 4/7. Ad a result, the answer will be a.Step 2, 9x − 12 = 13 + 2x. Hope it help!