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SVETLANKA909090 [29]
3 years ago
15

Jace and his children went into a bakery and he bought $9 worth of cookies and brownies. Each cookie costs $0.75 and each browni

e costs $3. He bought twice as many cookies as brownies. Graphically solve a system of equations in order to determine the number of cookies, x,x, and the number of brownies, y,y, that Jace bought.
Mathematics
2 answers:
tia_tia [17]3 years ago
8 0

Answer:

Step-by-step explanation:

\underline{\text{Variable Definitions:}}

Variable Definitions:

​  

 

x=

x=

\,\,\text{the number of cookies}

the number of cookies

y=

y=

\,\,\text{the number of brownies}

the number of brownies

One cookie costs $0.75, so xx cookies cost 0.75x.0.75x. One brownie costs $3, so yy brownies cost 3y.3y. The total 0.75x+3y0.75x+3y equals \$9:$9:

0.75x+3y=9

0.75x+3y=9

Since Jace bought twice as many cookies as brownies, there are more cookies, so if we multiply 2 by the number of brownies, we will get the number of cookies, meaning xx equals 2y.2y.

x=2y

x=2y

\underline{\text{Write System of Equations:}}

Write System of Equations:

​  

 

0.75x+3y=

0.75x+3y=

\,\,9

9

x=

x=

\,\,2y

2y

\underline{\text{Solve for }y\text{ in each equation:}}

Solve for y in each equation:

​  

 

\begin{aligned}\color{indianred}{0.75x}+3y = 9\hspace{10px} & \hspace{10px}x=2y \\[10px] 3y = \color{indianred}{-0.75x}+9\hspace{10px} & \hspace{10px}2y=x \\[10px] \frac{3y}{3} = \frac{-0.75x+9}{3}\hspace{10px} & \hspace{10px}\color{green}{y}\color{green}{=}\color{green}{\frac{1}{2}x} \\[10px] \color{blue}{y} \color{blue}{= -\frac{1}{4}x+3}\hspace{10px}\hspace{10px} & \hspace{10px} & \end{aligned}

0.75x+3y=9

3y=−0.75x+9

3

3y

​  

=  

3

−0.75x+9

​  

 

y=−  

4

1

​  

x+3

​  

 

x=2y

2y=x

y=  

2

1

​  

x

​  

 

​  

 

0

the number of cookies

the number of brownies

x

y

(4, 2)

0

the number of cookies

the number of brownies

The xx variable represents the number of cookies and the yy variable represents the number of brownies. Since the lines intersect at the point \left(4, 2\right)(4,2) we can say:

Jace bought 4 cookies and 2 brownies.

MA_775_DIABLO [31]3 years ago
6 0

Answer:

(9, 18) (3, 6) Plz correct me if wrong

Step-by-step explanation:

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7 0
4 years ago
Altogether Central High School's bands have 40 trumpets and 35 tubas. Carlee says the ratio of trumpets to tubas is 40:35. Danny
inna [77]

Answer:

Explanation is given below.

Step-by-step explanation:

Given:

Number of Trumpets = 40

Number of tubas = 35

Carlee says, the ratio of trumpets to tubas = 40 : 35

Danny says,  the ratio of trumpets to tubas = 8 : 7

To explain why the two ratios are equivalent.

Solution:

Equivalent ratios are all ratios which are equal to each other in their reduced to simplest form.

The ratio of trumpets to tubas can be given as = \frac{40}{35}

To reduce the ratio to its simplest form, we divide both numbers by their G.C.F.

The G.C.F. for 40 and 35 is 5.

So, we divide numerator and denominator by 5.

⇒ \frac{40\div5}{35\div 5}

⇒ \frac{8}{7}

Thus, the simplest ratio of trumpets to tubas can be given as = 8:7

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5 0
4 years ago
The area of a parallelogram is 18 square units.one side of the parallelogram is 24 units long.The other side is 6 unit long. whi
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Answer:

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Step-by-step explanation:

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3 years ago
What is4-8a=4(5-3a)​
kenny6666 [7]

Answer:

a=4

Step-by-step explanation:

<u>Question: 4-8a=4(5-3a)</u>

<u />

1) Distribute 4 to 5 and -3a:

4-8a=20-12a

2) Add 12a to both sides:

4+4a=20

3) Subtract 4 from both sides:

4a=16

4) Divide both sides by 4:

a=4

Footnotes:

- The <em>Distributive</em> property says a(b+c)=ab+ac

7 0
3 years ago
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