Algebra help..?

Question

Don't know how to solve for a

-4a-8=-3a+7

Answer 1

First: combine "like" terms by adding "8" to both sides (when you move a variable/number to the opposite side, always use the opposite sign)....

- 4a - 8 + 8 = - 3a + 7 + 8

- 4a = - 3a + 15

Sec: add "3a" to both sides....

- 4a + 3a = - 3a + 3a + 15

- a = 15

Third: the variable "a" can't be negative > change every sign....

a = - 15

Answer 2

Move your A's to one side and the numbers to the other:

-4a-8=-3a+7
+4a +4a=
-8=a+7
-7 -7=
a=-15

Answer 3

First, try to isolate the a. Move the -3a from the right side to the left side by subtracting -3a from both sides (which means you are adding since subtracting a negative makes a positive.

You then have
-4a + 3a - 8 = -3a + 3a + 7

The 3a is cancelled out so you have:
-1a - 8 = 7 when simplified

Now move the 8 to the right side.

-1a - 8 + 8 = 7 + 8

So -a=15 which also means a = -15

Hope this helps! Good luck!

Answer 4

collect like terms on each side:

add 3a and 8 to both sides:
-4a + 3a = 7 + 8
-a = 15
divide both sides by -1
a = -15

Answer 5

-4a-8=-3a+7
-4a-8+3a-7=0
-1a-15=0
-1a=15
a=-15
Therfore a is equal to -15

Answer 6

-4a - 8 = -3a + 7
-4a = -3a + 15
- 1a = 15
a = -15

Answer 7

-4a-8=-3a+7
-4a+3a=8+7
-a=15
divide bothside by -1 or multiply bothside by -1
a=-15

Answer 8

-4a-8
-3a+7=7a-13

Answer 9

a=15.