SOLUTION: Justin has already saved $100 and wants to buy a playstation 2 for $129 about four weeks from now. To find how much he should save each week between now and then, he wrote 100+4x=1

Algebra ->  Expressions-with-variables -> SOLUTION: Justin has already saved $100 and wants to buy a playstation 2 for $129 about four weeks from now. To find how much he should save each week between now and then, he wrote 100+4x=1      Log On


   



Question 158945: Justin has already saved $100 and wants to buy a playstation 2 for $129 about four weeks from now. To find how much he should save each week between now and then, he wrote 100+4x=139.99. Explain this equation.
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
100%2B4x=139.99 -------------> basic eqn
x= savings he need to have per week in $$$$$
4= # of weeks to do it
100= prior savings he got
139.99 = total savings he'll get in 4 weeks
Continuing the above eqn,
100%2B4x=139.99
4x=139.99-100
4x=39.99 ------> cross%284%29x%2Fcross%284%29=cross%2839.99%29%2Fcross%284%29
x=9.998, THE SAVINGS HE NEED TO HAVE EVERY WEEK in 4 WEEKS To HAVE $139.99 (I guess $129 + tax).
Thank you,
Jojo