The mistake is in step 3:
I: −2m =−12 − 2n
II: 2m = 8 + 8n
the student set both right sides of the equations equal (−12 − 2n = 8 + 8n), but the left sides aren't equal: first equation has -2m, second has +2m so the signs of one of the equations must be inverted first
Answer:
36
Step-by-step explanation:
6 x 2= 12
12 x 3= 36
Answer:
12i
Step-by-step explanation:
be careful with your screenshots and make sure it doesnt show your name
Answer:
x=-7
Step-by-step explanation:
5x-2x+1=3x-6-x first combine like terms
3x+1=2x-6 combine like terms by subtracting 2x from both sides
x+1=-6 subtract 1 from both sides
x=-7
The second one is the only equivalent equation. Simply plug in each variable in each equation. And compare!
