Question

Solve the equation Three x minus six equals fifteen for x.

x equals three

x equals seven

x equals twenty-seven

x equals sixty-three

Answer 1

State your words mathematically:

3x-6=15

Now add 6 to both sides of your equation.

Answer 2

ok um.. well 6 + 3 is 9 and then 6 + 15 is 21

Answer 3

ok

Answer 4

There is no 6+3

You can only add like terms.

so you can add 10 to 20, and you can add 14y to 27y, but you can't add 10 to 27y

So all you have by adding 6 to both sides is:
3x-6+6 = 15+6

So let's take it from here... :-)

Answer 5

ok :)

Answer 6

So what do you get if you simplify:

3x -6 +6 = 15+6

Answer 7

idk srry I really bad at math

Answer 8

Okay...

How much is -6+6?

Answer 9

12

Answer 10

Nope.

It's NEGATIVE 6 plus POSITIVE 6

You can even swap it around:

-6+6

is the same as

+6-6

Which is more familiar as:
6-6

Which is... ?

:-)

Answer 11

Hello?

Answer 12

sorry I was doing something

Answer 13

So am I.

I'm trying to help you with a problem you posted.

Answer 14

So what is -6+6?

Answer 15

it would be 0 right??

Answer 16

CORRECT!!!!! :-)

So armed with that information, how can we simply:

3x -6 +6 = 15+6

Answer 17

*simplify

And don't let this throw you: "0" is a perfectly good number which we can show or get rid of at our discretion.

Answer 18

ok

Answer 19

ok so it would be 3x -0 = 15+6 right

Answer 20

CORRECT AGAIN!!! :-)

Now simplify the right hand side

Answer 21

ok it would be 21 right :D

Answer 22

RIGHT!! So what we have so far is:

3x -0 = 21

Now since we can add 0 or subtract 0 without making any difference at all, then it follows that we can also dismiss any 0 values without penalty, right?

So that would leave us with:

3x = 21

Now that we have "isolated the terms" as it's called, we can now solve for "x"

And we do that by dividing both sides by 3

PS: You can't add or subtract 3 from/to 3x, but you ARE allowed to multiply and divide 3x by 3)

Answer 23

its x=7 isn't it :)

Answer 24

YAY!!!!! POP THE CHAMPAGNE!!!!

That's your answer! You've just "solved for x"!! :-)

Answer 25

lol

Answer 26

So you're all set now?

Answer 27

yup thank you so much you had helped me a lot :-)

Answer 28

No problem!! I'm very happy I could help!

And thank you for the medal, as well! :-)

Answer 29

:D your welcome

Answer 30

correct