Corey Franklin said:Well, I think I did better on one of them; still confused on the other...
2v+18=16-4v-28 you are correct up to this point.
Now, simplify the right-hand side by combining like terms:
2v + 18 = -4v - 12
Eliminate the variable term from one side.....it LOOKS like you have attempted to eliminate the 2v from the left side, which is ok. BUT, you'd need to add -2v to both sides to do that:
2v + 18 + (-2v) = -4v - 12 + (-2v)
18 = -6v - 12
Now, get the variable term by itself. To eliminate the " - 12" from the right side, ADD 12 to both sides:
18 + 12 = -6v - 12 + 12
30 = -6v
Divide both sides by -6:
30 / (-6) = (-6v) / (-6)
-5 = v
CHECK YOUR ANSWER. Is the original equation true when we substitute -5 for v?
2(-5) + 18 = 16 - 4(-5 + 7)
-10 + 18 = 16 - 4(2)
8 = 8 True. It checks.
18=16-2v-28 This step is incorrect and so is everything that follows this step.
v=-5 this is the correct answer, but IT DOES NOT COME from the work you've shown! (maybe it came from the back of the book??).
I know I shouldn't have added the 9 and the 3, guess I was too tired...