SOLUTION: A kid has 9 baseball cards. Every week he gains 4 more cards. Use the formula y=mx+b figure out how long it would take to reach 57 cards. Remember to use let statements for both th

Question 855078: A kid has 9 baseball cards. Every week he gains 4 more cards. Use the formula y=mx+b figure out how long it would take to reach 57 cards. Remember to use let statements for both the y and the x.
I need help with this problem. I am also supposed to graph my equation, but I am not sure how to start out the let statements, because that is where I could get the whole problem wrong. Please help me with the whole problem though. Thanks!!
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the number of cards he has
at the beginning of week
------------------------
week 0:

week 1:

week 2:

week 3:

------------------
The equation is:

------------------
They want to know what is ( the week number )
when

Subtract from both sides

At the end of week 12 he has 57 cards
------------------------------------
Here's the plot:

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