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Monica's school band held a car wash to raise money for a trip to a parade in New York City. After washing 125 cars, they made [tex]$775 from a combination of $[/tex]5.00 quick washes and $8.00 premium washes.

Let [tex]\( x \)[/tex] represent the number of quick washes and [tex]\( y \)[/tex] represent the number of premium washes. Which system of linear equations represents the situation?

A. [tex]\( 5x + 8y = 775 \)[/tex] and [tex]\( x + y = 125 \)[/tex]
B. [tex]\( 5x - 8y = 125 \)[/tex] and [tex]\( x + y = 775 \)[/tex]
C. [tex]\( 5x + 8y = 775 \)[/tex] and [tex]\( x - y = 125 \)[/tex]
D. [tex]\( 5x - 8y = 125 \)[/tex] and [tex]\( x - y = 775 \)[/tex]

Sagot :

GinnyAnswer
To determine the correct system of linear equations representing the situation where Monica's school band raised money through car washes, let's analyze the problem step-by-step:

1. Define Variables:
- Let [tex]\( x \)[/tex] be the number of quick washes.
- Let [tex]\( y \)[/tex] be the number of premium washes.

2. Total Cars Washed:
- According to the problem, the total number of cars washed is 125. This gives us our first equation:
[tex]\[ x + y = 125 \][/tex]

3. Total Money Raised:
- The school band raised a total of [tex]$775 from the car washes. - The quick wash costs $[/tex]5.00, so the money raised from the quick washes is [tex]\( 5x \)[/tex].
- The premium wash costs $8.00, so the money raised from the premium washes is [tex]\( 8y \)[/tex].
- The total money raised from both types of washes is:
[tex]\[ 5x + 8y = 775 \][/tex]

4. Form the System of Equations:
- Combining the equations derived from the total number of cars washed and the total money raised, we have the system of linear equations:
[tex]\[ \begin{cases} x + y = 125 \\ 5x + 8y = 775 \end{cases} \][/tex]

5. Compare with Given Options:
- Compare our derived system with the given options:
1. [tex]\( 5x + 8y = 775 \)[/tex] and [tex]\( x + y = 125 \)[/tex]
2. [tex]\( 5x - 8y = 125 \)[/tex] and [tex]\( x + y = 775 \)[/tex]
3. [tex]\( 5x + 8y = 775 \)[/tex] and [tex]\( x - y = 125 \)[/tex]
4. [tex]\( 5x - 8y = 125 \)[/tex] and [tex]\( x - y = 775 \)[/tex]

- The system we derived matches the first option:

[tex]\[ \boxed{1}\; \text{(5x + 8y = 775 and x + y = 125)} \][/tex]

Hence, the correct system of linear equations representing the situation is:
[tex]\[ \boxed{1} \][/tex]
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