How do you solve for x in these problems?

Question

1. Solve for x.

15x + 6 = 10x + 21

2. 13x + 7 = 5x - 20

3. 16x - 5 = 18x - 2

4. 7x - 3/8 = 6x - 5/8

Answer 1

youve got to take the x to the other side etc.

cant really explain it.

so you take the 6 over the equals sign and it will change to anegative because of this. Next take the 10x to where the 15 x.

it will look like this

15x - 10x = 21 - 6

5x=15

and then you simplify it

it will then be x = 3

see if you can do the other ones..:)

xox

Answer 2

Question 1

5x = 15

x = 3

Question 2

8x = - 27

x = - 27 / 8

Question 3

- 3 = 2x

x = - 3 / 2

Question 4

x = - 2 / 8

x = - 1 / 4

Answer 3

1. x=3

2. x=-27/8

3. x=-3/2

4. x= 5/3

it is a trick question

Answer 4

15x +6=10x+21

15x-10x=21-6

5x=15

x=3

2. 13x+7=5x-20

13x-5x=-20-7

8x=-27

x= -27/8

3.16x-5=18x-2

16x-18x=-2+5

-2x=3

x= -3/2

4.7x-3/8=6x-5/8

56x-3            48x-5

---------  =         -----------

8                        8

56x-3=48x-5

56x-48x=-5+3

8x=-2

x=-2/8=-1/4

Please rate me if u like my answer.

:))

Answer 5

1)X=5

2)X=-27/8

3)X=-3/2

4)X=-1/4

Answer 6

You "move" all the X terms to one side of equation and all the "non-X" terms to the other.

Step 1.  Move the add/subtract X & non-X terms

Step 2.  Combine X terms

Step 3.  Move multiply & divide terms

Rule.  You must do same math operation to both sides of an equation.

example:   10x +7 = 17 - 3x

subtract 7 from both sides:    10x      =      10 - 3x

add 3 x to both sides:   10x + 3x   = 10

combine 13x = 10

divide both sides by 13:  x = 10/13

Answer 7

1 . 15x-10x=21-6

5x=15

x=3

2. 13x-5x=-20-7

8x=27

x= 27/8

3. -5+2=18x-16x

-3=2x

x=-(3/2)

4. 7x-6x=-(5/8)+(3/8)

x= -2/8 or -1/4

Answer 8

1. 15x + 6 = 10x + 21

subtract 10x and 6 from each side

5x = 15

divide by 5

x = 5

2. x = -27/8

3. x = -3/2

4. x = 1/4

you better gimmie 10 points for doin your homework

Answer 9

  1. 15x-10x =21-6

          5x = 15   or       x =15/5 =3

  2.13x-5x =-20-7

         9x =-27  or        x = -27/9 = -3

  3.16x -18x = -2+5

          -2x = 3    or      x = -3/2 = -1.5

  4.7x -6x = -5/8 +3/8

         x =-2/8 = -0.25

Answer 10

Just rearrange, by placing all the terms with x on one side, and all the non-x terms on the other. Then just divide to get x by itself.

The answers are:

1. 5x = 15

therefore x = 3

2. 8x = -27

therefore x = -27/8

3. 2x = -3

therefore x = -3/2

4. x = -1