anonymous
  • anonymous
translate to a system of equations and solve Molly is 4 years is younger than heidi in 3 years Heidi will be ticw as old as Molly. how old are they now?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
\[Molly + 4 = Heidi\] \[2*(Molly + 3) = Heidi + 3\] Can you solve it on your own?
anonymous
  • anonymous
no
anonymous
  • anonymous
you know from the first statement/equation, that Heidi = Molly + 4 . I you substitute this into the second Equation it looks like this: \[2 * (Molly + 3) = (Molly + 4) + 3\] So now you can solve for Molly and plug it back into either the first or the second equation...

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anonymous
  • anonymous
so it is 6 and 11
radar
  • radar
I don't think so, because it was said that Molly is 4 years younger than Heidi, and 11-6=5 should be 4!!
anonymous
  • anonymous
then how old are they now??
radar
  • radar
You got Heidi's age correct. Review your work and see if you made an arithmetical error.
radar
  • radar
Actually you did not get heidi's age right. They are both wrong.
radar
  • radar
Do this one over and see what you get. 2 * (Molly + 3)= (Molly +4)+3 What did you get for Molly?
radar
  • radar
Let M= Mollly, so that it will look like this: 2(M+3)=(M+4)+3
radar
  • radar
Solve for M
radar
  • radar
The solution is for their age now.
anonymous
  • anonymous
2 and 6???
radar
  • radar
Lets see where you are going with this. starting with the eequation 2(M+3)=(M+4)+3 Remove paren' 2M+6=M+4+3 consolidating like terms 2M+6=M+7 do we agree thus far?
radar
  • radar
Next step is to subtract 1M and 6 from both sides of the equal sign. 2M-M+6-6=M-M+7-6 Consolidating similar terms Now you have Molly's age!
radar
  • radar
What did you get when you combined the terms of the equation?
radar
  • radar
Have you reached the point where you discovered your previous error?
anonymous
  • anonymous
so it is one and five?????
radar
  • radar
Absolutely it checks out.
radar
  • radar
Anything about the solution method that you haves questions or comments ??
anonymous
  • anonymous
it is 1 and 5??? did i get it right???
anonymous
  • anonymous
yes, it it - you got the right answer.

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