lovelycharm
  • lovelycharm
elimination 4x - 7y = 3 x - 7y = -15
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Do you understand how to substitute?
lovelycharm
  • lovelycharm
yeh
anonymous
  • anonymous
Okay, firstly, you want one equation as either Y or X by itself.

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anonymous
  • anonymous
If you do that part, i'll then explain the next step.
lovelycharm
  • lovelycharm
okay wat the next step
anonymous
  • anonymous
write the equation you've got for your isolated variable in here.
lovelycharm
  • lovelycharm
|dw:1360887641308:dw| is that right how i solve for y
anonymous
  • anonymous
- 7y + - 7y is not zero and 4x + x is 5x
anonymous
  • anonymous
You need a variable to cross out when you add down. Try multiplying one of the equations by a certain number so that one variable crosses out when you add down.
lovelycharm
  • lovelycharm
could u show me the step please @Rachel98
anonymous
  • anonymous
Okay, here is an example problem I'll draw it.
anonymous
  • anonymous
|dw:1360888023089:dw|
anonymous
  • anonymous
Now see how none of the variables cross off? So I'm going to try multiplying the first equation by - 1 and see what happens.
anonymous
  • anonymous
|dw:1360888146491:dw|
anonymous
  • anonymous
Now see if you add straight down a variable crosses off when you add down. - y and y can also be put as - 1y and 1y. Look at the numbers - 1 + 1 = 0, so that crosses off.
anonymous
  • anonymous
|dw:1360888346035:dw|
anonymous
  • anonymous
Now all we have to do is divide both sides by - 1, so undo the multiplication
anonymous
  • anonymous
|dw:1360888489391:dw|
anonymous
  • anonymous
So we have our x value, now what about y? What we do is we plug in the x value (substitute 8 for x) in one of the original equations. In this case the bottom equation is easier to do this.
lovelycharm
  • lovelycharm
could u help me with my problem cuz i dont understand ur problem
anonymous
  • anonymous
|dw:1360888601809:dw|
anonymous
  • anonymous
See, in my problem how I multiplied one equation by - 1? Try doing that with either one of your equations and then add down.
anonymous
  • anonymous
Remember, a negative * a negative is a positive.
anonymous
  • anonymous
|dw:1360888933281:dw|
anonymous
  • anonymous
Did you get it? Give it a try. I'll check your answer and if you make a mistake I'll work through it for you.

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