My daughter is having a really hard time in algebra. Can some one please help? 4x-9=7x+12?

Question

My daughter is having a really hard time in algebra. Can some one please help? 4x-9=7x+12?

Answer 1

4x - 9 = 7x + 12.

an easy step for beginning algebra that makes it easy is to make one side 0 by subtracting one side over. this is not essential, but makes it simpler. here is step 2:

4x - 7x - 9 + 12 = 0.

which simplifies to

-3x + 3 = 0

now put the variable(s) and integers on separate sides.

3=3x

its pretty obvious what the answer is now. but later it won't be that easy. divide the equation by a number multiplying x, and multiply a fraction where x is the numerator.

Answer 2

the first answer is wrong! dont learn from it!

Add 9 to twelve which gives you a positive 21.  SO your equation is 4x=7x + 21

Then subtract 7X from 4x which give you -3x.  Your equation then is

-3X=21.  Divide 21 by -3 whch gives you -7

Answer 3

4x-9=7x+12

4x-9(+9)=7x+12+(9)

isolate 4x by adding 9 to both sides of the equation...

4x=7x+21

4x-(7x)=7x-(7x)+21

isolate 21 by subtracting 7x from both sides

-3x/(-3)=21/(-3)

divide both sides by -3

x= -7

Answer 4

Isolate the X variable.

Add 9 to either side of the equation to remove it from the 4x-9 side.

You now have 4x= 7x +21

Subtract 7x from both sides

-3x=21

Divide both sides by -3

x=-7

Now check your work...

4(-7)-9= -37

7(-7) +12= -37

x=-7 is Correct!

Answer 5

4x-9=7x+12

4x-7x=12+9

-3x=21

-x=21/3

-x=7

x=-7

Answer 6

               .-7.                   ******!

Answer 7

4x-9=7x+12

   +9     +9

4x = 7x+21

-4    -4

x= 3x +21

    /3    /3

x= -7