anonymous
  • anonymous
Y=3x+2 Y=x+12 Using the substitution method can someone help me?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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texaschic101
  • texaschic101
you know that y = 3x + 2.....so just sub 3x + 2 in for y in the other equation.. y = x + 12 3x + 2 = x + 12 (subtract x from both sides) 3x - x + 2 = x - x + 12 (combine like terms) 2x + 2 = 12 (now subtract 2 from each side) 2x + 2 - 2 = 12 - 2 (combine like terms) 2x = 10 (now divide by 2 to get x by itself) 2x/2 = 10/2 x = 5 now sub 5 in for x in either of the original equations y = x + 12 y = 5 + 12 y = 17 check... y = 3x + 2 17 = 3(5) + 2 17 = 15 + 2 17 = 17 (correct) ANSWER : x = 5 and y = 17 or (5,17) Do you have any questions ? If so, please ask.
anonymous
  • anonymous
First solve the top equation for x, and put the result in the x of the 2nd equation. Looks like texa's gotcha covered!
anonymous
  • anonymous
Thanks for helping. I'll have another question up in a little bit. @texaschic101

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texaschic101
  • texaschic101
I probably shouldn't have given the answer...but everyone needs a break sometimes :)
anonymous
  • anonymous
it really helped though i understand the steps and what to do. @texaschic101
texaschic101
  • texaschic101
thats good....but remember, if you have any question or concerns, please ask.
anonymous
  • anonymous
3x+y=10 y=x-2 you think you could help me out @texaschic101
texaschic101
  • texaschic101
you know that y = x - 2. So sub x - 2 in for y in the first equation. Can you do that ?
texaschic101
  • texaschic101
I will walk you through this one.....I will not give the answer....you will find the answer. Let me start you off... 3x + y = 10 3x + x - 2 = 10 now get the x's on one side and everything else on the other side. Now it is your turn.
texaschic101
  • texaschic101
are you having trouble ?
texaschic101
  • texaschic101
3x + x - 2 = 10 (combine like terms then solve for x) let me know if you need help.....

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