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denpristay [2]
3 years ago
6

Heather has $500 in her savings account. She withdraws $20 per week for gas. Write an equation Heather can use to see how many w

eeks it will take her to have a balance of $200.
Mathematics
2 answers:
marusya05 [52]3 years ago
5 0
500-20x=200 is the equation
PtichkaEL [24]3 years ago
3 0
So first I would subtract 200 from 500 so you have 300. Then take 300 and divide it by 20 so you answer is it will take 15 weeks to get her to have a balance of $200. 20x + 200 = 500
 x = 15
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in 1990 automobile dealership sold certain model car for $14 and 649 cents in 2000 so the same model car for $23 and 609 cents f
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New prize: 23.609

(the years here are not relevant, just to confuse you with more numbers)

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Express the situation as a system of two equations in two variables. Be sure to state clearly the meaning of your x- and y-varia
expeople1 [14]

Answer:

9 TV ads and 20 radio ads

Step-by-step explanation:

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The same happens with the amount of voters he needs to reach, the equation is 130000 = 10000x + 2000y

The system that represents this is

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And the augmented matrix is

\left[\begin{array}{cc|c}3000&500&37000\\10000&2000&130000\end{array}\right]

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Then we multiply the second row by (-1) and we add the first row:

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Now we multiply the second row by -30:

\left[\begin{array}{cc|c}1&1/6&37/3\\0&1&20\end{array}\right]

Finally, to the first row we add the second one multiply by (-1/6):

\left[\begin{array}{cc|c}1&0&9\\0&1&20\end{array}\right]

So, x = 9 and y = 20

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3 years ago
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