alejandrosaaved1
20.07.2019 •
Mathematics
Michiko claims that to solve the system of linear equations 15x+8y=1 and 21x+4y=-13, instead of multiplying the second equation by –2 and then adding the equations, she could multiply the second equation by 2 and then subtract the second equation from the first equation. which statement is correct? a michiko is right for this system of linear equations, but her method will not work for other systems of linear equations. b michiko is right for this system of linear equations, and her method will also work for other systems of linear equations. c michiko is wrong because her method will give the opposite of the correct value for x for any system of linear equations. d michiko is wrong because her method will give the opposite of the correct value for y for any system of linear equations.
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Ответ:
Michiko is right for this system of linear equations, and her method will also work for other systems of linear equations.
Ответ:
15x + 8y = 1
21x + 4y = -13
We can rewrite the system as:
15x + 8y = 1
-42x-8y = 26
Or equivalently:
15x + 8y = 1
42x + 8y = -26
Next we have:
Method 1:
Add equations:
-27x = 27
Method 2:
Subtract equations:
-27x = 27
Therefore, both methods work correctly.
B Michiko is right for this system of linear equations, and her method will also work for other systems of linear equations.
Ответ:
1417-109x<100
Step-by-step explanation: