Friday

October 9, 2015
Posted by **Ashley** on Thursday, August 7, 2014 at 12:46pm.

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**Steve**, Thursday, August 7, 2014 at 12:49pmSounds like a good plan.

Was there a question in there somewhere?

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**Ashley**, Thursday, August 7, 2014 at 12:59pmI was trying to find the expression for the problem

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**Ashley**, Thursday, August 7, 2014 at 1:08pmI have to find the equation of the line, but I need the expression to solve it.

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**Steve**, Thursday, August 7, 2014 at 1:22pmlooking at the data, it appears she saved #25 each week. So, after x weeks, her saving y would be

y = 25x

You can work into that by noting that if

y = mx+b

when x=7,

175 = 7m+b

when x=15,

375 = 15m+b

so, 8m = 200

m = 25

Now you have

y = 25x+b

plugging either point shows that b=0, so

y = 25x

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**Ashley**, Thursday, August 7, 2014 at 1:38pmHow much was in her account four weeks after she began saving?

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**Ashley**, Thursday, August 7, 2014 at 2:11pmOops wrong question

I meant to ask

When she started saving money, 203 shopping days were left until Christmas. How much money was in her account at Christmas?

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**Steve**, Thursday, August 7, 2014 at 2:40pmwell, you have the equation. How many weeks from the time she started saving, until Christmas? $25/week, babe.

I assume you know how many days per week . . .

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**Ashley**, Thursday, August 7, 2014 at 2:43pmThank you I got it....so helpful

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**Christy**, Wednesday, August 19, 2015 at 2:19pmI have that same question but every time I try to put the expression it says it's wrong can you please tell me the expression you used??