ayoismeisjjjjuan
19.08.2019 •
Mathematics
Jake and seth put some money into their money boxes every week. the amount of money (y), in dollars, in their money boxes after a certain amount of time (x), in weeks, is shown by the equations below:
jake: y = 5x + 85
seth: y = 20x + 40
after how many weeks will jake and seth have the same amount of money in their money boxes and what will that amount be?
3 weeks, $100
3 weeks, $285
6 weeks, $150
100 weeks, $3
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Ответ:
5x + 85 = 20x + 40
45 = 15x
x = 3 weeks
2) How much money will that be? plug x = 3 back into the equation to solve for y:
Jake: 5(3) + 85 = $100
Seth: 20(3) + 40 = $100
answer is $100
Ответ:
jake=y=5x+85
seth=y=20x+40
so when seth=jake or y=y or 5x+85=20x+40 then they have same ammount of money so solve for when they are equal
5x+85=20x+40
subtract 40 from both sides
5x+45=20x
subtract 5x from both sides
45=15x
divide boht isdes yb 15
3=x
after 3 weeks
then subsitute 3 into the equation
20x+40=y
20(3)+40=y
60+40=y
100=y
the answer is
3 weeks, $100
Ответ:
The answer is :1/250
hope this helps!