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\[Molly + 4 = Heidi\] \[2*(Molly + 3) = Heidi + 3\] Can you solve it on your own?
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...
so it is 6 and 11
I don't think so, because it was said that Molly is 4 years younger than Heidi, and 11-6=5 should be 4!!
then how old are they now??
You got Heidi's age correct. Review your work and see if you made an arithmetical error.
Actually you did not get heidi's age right. They are both wrong.
Do this one over and see what you get. 2 * (Molly + 3)= (Molly +4)+3 What did you get for Molly?
Let M= Mollly, so that it will look like this: 2(M+3)=(M+4)+3
Solve for M
The solution is for their age now.
2 and 6???
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?
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!
What did you get when you combined the terms of the equation?
Have you reached the point where you discovered your previous error?
so it is one and five?????
Absolutely it checks out.
Anything about the solution method that you haves questions or comments ??
it is 1 and 5??? did i get it right???
yes, it it - you got the right answer.