Question

If 2m−6=8m then 3m= A. 3 B. -1 C. -3 D. -6 E. I don't know.

Answer 1

For this case we have to:

$2m-6 = 8m$

If we subtract 8m on both sides of the equation, we have:

$2m-6-8m = 8m-8m\\-6m-6 = 0$

Adding 6 to both sides of the equation:

$-6m-6 + 6 = + 6\\-6m = 6$

Dividing between -6 on both sides of the equation:

$\frac {-6m} {6} = \frac {6} {6}\\-m = 1$

So:

$m = -1$

If we want to know the value of 3m, then:

$3m = 3 (-1) = - 3$

Answer:

Option C