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iris [78.8K]
4 years ago
14

I need help ASAP .......

Mathematics
1 answer:
pickupchik [31]4 years ago
4 0

Answer:

0

Step-by-step explanation:

its 0 because if you add 29 and 31 and 10 youll need to simplify and it wont be very exact so you would have to fracertize and it would equle 0

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago
Select all the statements that are true for the following systems of equations.
Dvinal [7]
Answer:

The true statements are:

the first statement: Systems A and C have the same solution
the fourth statement: System C simplifies to 2x - 3y = 4 and 4x - y = 18
the fifth statement: Systems A and B have different soltuoins.

Explanation:

1) The first statement: systems A and C have the same solutiotn: TRUE

The fourth statement proves that that the two systems are equivalent which means that both have the same solution.

2) The second statement: All three systems have different solutions: FALSE

The fourth statement proves that the systems A and C have same solution, so this second statement is false.

3) The third statement: Systems B and C have the same solution: FALSE

<span>You can solve the two systems and will find the solutions are different

Solution of system B.

3x - 4y = 5
y = 5x + 3

replace y = 5x + 3 in the first equation => 3x - 4(5x + 3) = 5

=> 3x - 20x - 12 = 5

=> - 17x = 5 + 12

=> -17x = 17

=> x = - 17 / 17

=> x = - 1

y = 5x + 3 = 5(-1) + 3 = - 5 + 3 = - 2

=> solution x = -1 and y = -2

Solution of system C.

2x - 3y = 4
12x - 3y = 54

subtract
</span>
4) fourth statement: System C simplifies to <span>2x - 3y = 4 and 4x - y = 18 by dividing the second equation by three: TRUE

Look:

Second equation of system C = 12x - 3y = 54

Divide by 3:

12x - 3y     54
----------- = -----
     3           3

Distributive property:

12x      3y      
------ - ----- = 18
   3        3

4x - y = 18, which is the same second equation of system A, so the system C simplifies to the same system A, which is 2x - 3y = 4 and 4x - y = 18.

5) The fifth statement: systems A and B have different solutions: TRUE

</span><span>You can solve the two systems and will find the solutions are different

Solution of system A:

  2x - 3y =  4     
12x - 3y = 54           since it is equivalent to 4x - y =  18
-------------------
12x - 2x = 54 - 4      subtracting the first equation from the secon

10x = 50                  adding like terms

x = 5                        dividing by 10

From 2x - 3y = 4 => 3y = 2x - 4 = 2(5) - 4 = 10 - 4 = 6

=> y = 6 / 3 = 2

=> x = 5, y = 2

Solution of system B.

3x - 4y = 5
y = 5x + 3

replace y = 5x + 3 in the first equation => 3x - 4(5x + 3) = 5

=> 3x - 20x - 12 = 5

=> - 17x = 5 + 12

=> -17x = 17

=> x = - 17 / 17

=> x = - 1

Which is enough to prove that the two systems have different solutions.</span>
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