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saw5 [17]
3 years ago
13

Barbara charges $3.50, plus $2.25 for each hour she babysits. If Barbara charges $21.50, how many hours does she babysit?

Mathematics
1 answer:
MAVERICK [17]3 years ago
8 0

Answer:

8 hours

Step-by-step explanation:

The equation is 2.25X + 3.50 = 21.50

X represents the unknown amount of hours she worked. 2.25 is the cost per hour. 3.50 is the fee she charges for every gig. That fee only happens once a gig so naturally it wasn't the number x was placed with.

2.25X + 3.50 = 21.50

2.25X + 3.50 - 3.50 = 21.50 - 3.50

2.25X = 18

<u>2.25X</u> = <u>1</u><u>8</u>

2.25 2.25

X = 8

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Answer:

 

Let's begin by writing the mathematical equations given by the sentences.

 

Let X = smaller number

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The first sentence tells us

X + Y = 38

 

The second sentence tells us

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Since you weren't given a specific method to use, you can use either the substitution method or the elimination(addition) method, whichever works best for you.

 

Since the 2nd equation has the X isolated, I'm going to isolate the X in the first equation,

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Since both equations are equal to X, I can set them equal to one another and solve for Y.

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Step-by-step explanation:

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