anonymous
  • anonymous
Is this right? 20. Determine the solution of the system. Show your work. Y = 5x – 9 -5x -5 -14 Y = 2x + 6 -2 -2 4
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
no. these equations are already solved for y, so set them equal to each other to solve for x. 5x - 9 = 2x + 6
anonymous
  • anonymous
Oh, thanks. thought it would of been harder then that XD
anonymous
  • anonymous
Can you help me out on my next problem?

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anonymous
  • anonymous
ok. did you get a y-value for the one above?
anonymous
  • anonymous
Isn't that the same as the x vaule?
anonymous
  • anonymous
5x -9 =2x +6
anonymous
  • anonymous
not necessarily. when they say "solve the system" they're asking for a point that makes both equations true. that point will have an x-coordinate and a y-coordinate. Once you have the x, substitute it into either one to get y
anonymous
  • anonymous
what did you get when you solved that equation for x?
anonymous
  • anonymous
-4x
anonymous
  • anonymous
5x -9 =2x +6 I added both x terms then subtracted -9 from 6 7 x- 3 7/7 -3/7
anonymous
  • anonymous
You can't add/subtract things on different sides of an equal sign. You can move things from one side to the other using addition or subtraction. Let's start by getting all the terms with x on the left side. To do that we need to eliminate 2x from the right side. Since 2x is positive, subtract 2x from both sides. |dw:1435682067537:dw|
anonymous
  • anonymous
|dw:1435682227453:dw|
anonymous
  • anonymous
Now you need to move -9 to the right side by adding 9 to both sides. Give it a try
anonymous
  • anonymous
|dw:1435693135233:dw| Do i divide next
anonymous
  • anonymous
should be 3x = 15, then divide
anonymous
  • anonymous
I was suppose to write 15 DX
anonymous
  • anonymous
Alright.
anonymous
  • anonymous
|dw:1435693293586:dw|
anonymous
  • anonymous
right. x = 5. Now to get y, you have to substitute into either equation. y = 2x + 6 y = 2(5) + 6 = ?
anonymous
  • anonymous
y =2(5) + 6 10 + 6 =16 y16
anonymous
  • anonymous
yes, so the solution the system is (5, 16).
anonymous
  • anonymous
X= 5 and y = 16. Do i plug them back into the original equation?
anonymous
  • anonymous
those are the answers. You can plug them in to check.
anonymous
  • anonymous
Do i need to do it or could i let it ride :P
anonymous
  • anonymous
no you don't need to. who's gonna know anyway?
anonymous
  • anonymous
:P Yay. Thanks for your help ^ ^
anonymous
  • anonymous
no problem

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