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Andrews [41]
2 years ago
14

Solve the following compound

Mathematics
1 answer:
hammer [34]2 years ago
5 0

Answer:

b<-12 or b>-12

(-∞,-12]U[-12,∞)

Step-by-step explanation:

0.5b > -6 or 3b + 16 <-8 + b

I solve these separately

0.5b > -6

Divide by .5 on each side

0.5b/.5 > -6/.5

b >-12  

or

3b + 16 <-8 + b  

subtract b from each side

3b-b + 16 <-8 + b -b

2b+16<-8

Subtract 16 from each side

2b+16-16<-8-16

2b< -24

Divide each side by 2

2b/2 <-24/2

b<-12

b<-12 or b>-12

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The bill for lunch was 24.50 mr smith add a 20% tip how much did mr smith pay
miss Akunina [59]

Answer:

Mr.Smith paid $29.4.

Step-by-step explanation:

Mr.Smith paid $24.5 plus additional 20% of $24.5, and to figure out the total amount that he paid, we need to know what is 20% of $24.50.

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2 years ago
Can someone help me please? Use the linear combination method to solve the system of equations. Pretty please show your work and
Pavel [41]

Answer:

  (x, y) = (4, -3)

Step-by-step explanation:

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First of all, look at the given equations. Here, we see that the second equation has coefficients that all have a factor of 2. If we divide that out, we get an equation that has an x-coefficient of 1, matching the x-coefficient in the first equation.

Here is the reduced second equation:

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We note that the y-coefficient in the first equation is less than that in the second equation. If we subtract the first equation from the second, the result will have a positive y-coefficient:

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We can use this value in the reduced second equation to find the value of x:

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The solution is (x, y) = (4, -3).

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I find a graphing calculator provides an easy and reliable check of the answer.

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<em>Comment on linear combination</em>

This method is often called "elimination," because the purpose of combining the equations in a particular way is to eliminate one of the variables. This requires you look at the coefficients of the variables and devise a plan to combine them so the resulting coefficient for one of the variables is zero.

In the worst case, you can combine ...

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by multiplying the second equation by <em>a</em> and the first by <em>-d</em>:

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  y(ae -bd) = fa -cd . . . . . . simplify; x is eliminated

This sort of approach results in a formula for the solution known as Cramer's Rule.

  y = (fa-cd)/(ae-bd)

The corresponding solution for x is ...

  x = (ce-bf)/(ae-bd)

__

The point of looking at the equations first is that you can often choose which variable to eliminate and what multiplier to use to minimize the amount of arithmetic involved—as we did above.

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Answer: Hello your question is poorly written attached below is the complete question

answer:

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Step-by-step explanation:

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