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NNADVOKAT [17]
3 years ago
10

A student bought a book for $7 and a pen. The total cost was $9. Which of the following equations can be used to find the cost o

f the pen?
Mathematics
2 answers:
Fynjy0 [20]3 years ago
4 0

Answer:

7+x=9

Step-by-step explanation:

if you subtract 7 from both sides of this you will get x=2 so the pen is $2

anygoal [31]3 years ago
3 0
<h2>Solution :</h2>

Total cost = $9

Cost of book = $7

Let the cost of pen be = x

Thus,

x+$7=$9

x=$9-$7

x=$2

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5x-9y=17 solve for y
Tresset [83]

Answer: y=17-5x/-9

Step-by-step explanation: 5x-9y=17

-9y=17-5x

Y=17-5x/-9

You can’t go any further than that because you can’t combine unlike Terms on the right side of the equation.

6 0
2 years ago
Evaluate -5-15+4+15
defon

Answer:

-1

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-5-15+4+15

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kicyunya [14]

Answer:

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2 years ago
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The owner of Maumee Ford-Mercury-Volvo wants to study the relationship between the age of a car and its selling price. Listed be
nadya68 [22]

Answer:

a= 13.15 years

b= -0.62 years/$

Step-by-step explanation:

Hello!

Given the variables

Y: Age of a used car. (years)

X: Price of a sold used car. ($000)

The linear regression model is:

E(Y)= α + βXi

The estimated equation is:

^Y= a + bXi

a= (\frac{sumY_i}{n} ) - b(\frac{sumX_i}{n} )

a= 13.15 years

b= \frac{(sumX_iY_i-\frac{(sumX_i)(sumY_i)}{n} }{sumX_i^2-(\frac{(sumX_i)^2}{n} )}

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Then ^Y= 13.15 - 0.62Xi

Mean Y= 8.92

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∑XY=712.9

Hope it helps!

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