Waakkaa
06.12.2021 •
Mathematics
Some banks charge a fee for a savings account that is left inactive for an extended
period of time. The equation y = 5000(0.98)X represents the amount remaining, y, of one
account that was left inactive for a period of x years. What does the number 5000
represent in this situation?
A fee charged for
an inactive account
The percent of
money in the
account after x
years
The amount of
money in the
account initially
The amount of
money in the
account after x
years
Solved
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Ответ:
3a + 5b = 14
Let's solve this system using elimination. Add the equations together to cancel the b-terms, then solve for a.
2a - 5b = 1
3a + 5b = 14
+
5a - 0 = 15
5a = 15
a = 3
Next, plug 3 for a into either of the equations and solve for b.
2a - 5b = 1
2(3) - 5b = 1
6 - 5b = 1
- 5b = -5
b = 1
Lastly, check all work by plugging both values for their respective variables.
2a - 5b = 1
2(3) - 5(1) = 1
6 - 5 = 1 -- This is true
3a + 5b = 14
3(3) + 5(1) = 14
9 + 5 = 14 -- This is true
The solution to the system of equations is (3, 1).