anonymous
  • anonymous
the second of two numbers is 3 less than twice the first their sum is 36. find the numbers
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
13 and 23. If you have done algebra, you could use one variable as x and another as y. y=2x-3, x+y=36 so x+2x-3=36 or 3x=39, so x=13 and y =2(13)-3=26
anonymous
  • anonymous
okay bmt this is a general principal you can use throughout math in your life. you need an equation for every unknown, in order to solve for both unknowns
anonymous
  • anonymous
you have two unknowns as grodon909 mentioned x and y (the two unknowns)

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anonymous
  • anonymous
one equation you can see is addition of the two unknowns is equal to 36 so x + y = 36
anonymous
  • anonymous
i know how to set them up i don't know how to do that problem that i said above
anonymous
  • anonymous
so you NEED one more equation to solve for both x and y that equation is the one gordon909 said y = 2x - 3
anonymous
  • anonymous
yeah its hard to understand how to set it up properly. you have to just take it step by step and write down each word into the equation
anonymous
  • anonymous
Usually, what you want to do if you can is solve for one variable/unknown value (for example y was already in such a format) and use it in another equation (ie replace y=(some equation) for y in all cases that you see y).
anonymous
  • anonymous
sometimes it seems slow and you wanna get it done. but its fast to get it right the first time then to have to redo it. i know that sounds corny but i found that is true everytime
anonymous
  • anonymous
i give up

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