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anonymous

  • 5 years ago

I have another question. solve the equation: 3x-5=2x+7 So, do I combine like terms?

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  1. anonymous
    • 5 years ago
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    you divide three on both sides

  2. mathteacher1729
    • 5 years ago
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    Are you trying to solve this algebraically? If so, you should subtract 2x from both sides: \[x-5=7\] Then add 5 to both sides \[x=12\] Test this to make sure it works: \[3(12)-5=2(12)+7\] \[36 -5=24+7\] \[31=31\] Yay! :D

  3. mathteacher1729
    • 5 years ago
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    I would strongly recommend graphing this to help understand that it's really the intersection of two lines. Let \[y_1=3x-5\] and \[y_2=2x+7\] You will see that they intersect at the exact (x,y) coordinate of (12,31) :)

  4. anonymous
    • 5 years ago
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    Yes, the answer in the book was x=12.. Thanks yet again!!

  5. mathteacher1729
    • 5 years ago
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    (on a TI calculator to find the intersection you may have to zoom out and then type 2nd > calc > intersect. ) Hope this helps!

  6. anonymous
    • 5 years ago
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    once I intersect I get x=12 and Y=31 on the TI

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