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baherus [9]
3 years ago
14

(1) Ax + By = C (2) Dx + Ey = F Jim is trying to solve the system of equations. He begins by multiplying equation (1) by D and e

quation (2) by A. Before he can continue, his friend Angela comes by and says, "No, you should have multiplied equation (1) by E and equation (2) by B. You're going to get the wrong answer." Is Angela right? Why or why not?
Mathematics
2 answers:
attashe74 [19]3 years ago
8 0

Answer:

No, Angela is not correct.

As the method Jim was performing will also lead to the solution.

Step-by-step explanation:

We are given first equation as:

                  Ax + By = C

Second equation is:

                   Dx + Ey = F

Jim solved the equation as:

He begins by multiplying equation (1) by D and equation (2) by A.

and so by subtracting both the equations he will obtain a value of y.

and then put the y-value in any of the given two equations to obtain the value of x.

Angela Method:

you should have multiplied equation (1) by E and equation (2) by B.

and when she will subtract both the equations she will get the value of x first and then when she will put the value of x in any of the given equation she will obtain the value of y.

But both will get a value for x and y.

Hence, the method Jim was performing was also correct.

Butoxors [25]3 years ago
6 0

Answer:

C

Step-by-step explanation:  

No; Jim is trying to eliminate x, while she is trying to eliminate y. Both ways will work.

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A scatter plot is made comparing x, the number of hours since midnight, with y, the number of lights turned on in a house. What
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Answer:

7 hours since midnight and 8 lights turned on.

Step-by-step explanation:

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8 0
2 years ago
The credit department of Lion's Department Store in Anaheim, California, reported that 30% of their sales are cash, 30% are paid
Oliga [24]

Answer:

Hence the probability that she paid cash is  0.105

Step-by-step explanation:  

P(cash) = 0.3  

P(credit card ) = 0.3  

P(debit card ) = 0.4  

P ( more than $50 | cash ) = 0.2  

P (more than $50 | credit card ) =0.9  

P (more than $ 50 |debit card ) = 0.6  

P ( more than $50) = P ( more than $50 | cash )* P (cash) + P (more than $50 credit card ) * P(credit card ) + P (more than $ 50 |debit card )* P(debit card )  

= 0.2 * 0.3 + 0.9 * 0.3 + 0.6* 0.4  

= 0.57  

P ( more than $50) = P ( more than $50 | cash )* P (cash) / P ( more than $50)  

= 0.2* 0.3 / 0.57  

= 0.105

6 0
3 years ago
Use the number 145,973 write the name of the period that has the digits 145
Alexeev081 [22]
145,973 Is decimaled in 145.
14.5
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7 0
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= k and k = 3, what is the value of x ?<br> 3<br> If<br> A) 2<br> B) 4<br> C) 9<br> D) 10
Brilliant_brown [7]

Answer:

the correct answer for this question is c)9

Step-by-step explanation:

because 3×3=9

3 0
3 years ago
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