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Posted by **vanessa** on Sunday, January 10, 2010 at 2:07pm.

- simple equations ( math) -
**Marth**, Sunday, January 10, 2010 at 2:17pmLet x = the amount of money that Peter has. Now try to set up the equation to solve for x.

- simple equations ( math) -
**vanessa**, Sunday, January 10, 2010 at 2:20pmsorry i don't understand

- simple equations ( math) -
**Marth**, Sunday, January 10, 2010 at 2:23pmYou want to solve for the amount of money that Peter has. So you let your variable equal that amount of money.

Now, you know that Peter's money + Joseph's money = $100.

Can you express the amount of money Joseph has in terms of x, the amount of money Peter has?

- simple equations ( math) -
**vanessa**, Sunday, January 10, 2010 at 2:27pmso altogether the have $100. Joseph has 3 time more then Peter. would joseph have $75 and Peter have $15 ?

- simple equations ( math) -
**Marth**, Sunday, January 10, 2010 at 2:28pmI believe you mean that Peter has $25, which would be correct.

Could you write the equation you used to solve that?

- simple equations ( math) -
**vanessa**, Sunday, January 10, 2010 at 2:30pmohyes sorry i meant that.

3/4 of 100 is 75

so the rest is 25

- simple equations ( math) -
**Marth**, Sunday, January 10, 2010 at 2:35pmAgain, where is your variable (x) in the equation?

You should have an equation that looks like the following:

"Peter's money + Joseph's money = $100"

x + J(x) = $100

where J(x) is a (simple) function expressing Joseph's money in terms of x.

The reason I ask is not to make it hard now, but because you will encounter problems that cannot be solved mentally - multiple variable problems, for example. You will need to be able to set up an equation from the word problem.

- simple equations ( math) -
**vanessa**, Sunday, January 10, 2010 at 2:38pmOh. ook ... thank you for your help

- simple equations ( math) -
**wendy**, Tuesday, November 27, 2012 at 10:26pmalex spent 3/7 of his money. he give 1/4 of the reminder to his sister. he had $120

left. how much money did he have in the begining