anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
State your words mathematically: 3x-6=15 Now add 6 to both sides of your equation.
anonymous
  • anonymous
ok um.. well 6 + 3 is 9 and then 6 + 15 is 21
anonymous
  • anonymous
ok

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anonymous
  • anonymous
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... :-)
anonymous
  • anonymous
ok :)
anonymous
  • anonymous
So what do you get if you simplify: 3x -6 +6 = 15+6
anonymous
  • anonymous
idk srry I really bad at math
anonymous
  • anonymous
Okay... How much is -6+6?
anonymous
  • anonymous
12
anonymous
  • anonymous
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... ? :-)
anonymous
  • anonymous
Hello?
anonymous
  • anonymous
sorry I was doing something
anonymous
  • anonymous
So am I. I'm trying to help you with a problem you posted.
anonymous
  • anonymous
So what is -6+6?
anonymous
  • anonymous
it would be 0 right??
anonymous
  • anonymous
CORRECT!!!!! :-) So armed with that information, how can we simply: 3x -6 +6 = 15+6
anonymous
  • anonymous
*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.
anonymous
  • anonymous
ok
anonymous
  • anonymous
ok so it would be 3x -0 = 15+6 right
anonymous
  • anonymous
CORRECT AGAIN!!! :-) Now simplify the right hand side
anonymous
  • anonymous
ok it would be 21 right :D
anonymous
  • anonymous
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)
anonymous
  • anonymous
its x=7 isn't it :)
anonymous
  • anonymous
YAY!!!!! POP THE CHAMPAGNE!!!! That's your answer! You've just "solved for x"!! :-)
anonymous
  • anonymous
lol
anonymous
  • anonymous
So you're all set now?
anonymous
  • anonymous
yup thank you so much you had helped me a lot :-)
anonymous
  • anonymous
No problem!! I'm very happy I could help! And thank you for the medal, as well! :-)
anonymous
  • anonymous
:D your welcome
anonymous
  • anonymous
correct

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