meganwintergirl
05.05.2021 •
Mathematics
A system of equations and its solution are given below.
System A
Choose the correct option that explains what steps were followed to obtain the system of equations below.
System B
A.
To get system B, the second equation in system A was replaced by the sum of that equation and the first equation multiplied by -5. The solution to system B will not be the same as the solution to system A.
B.
To get system B, the second equation in system A was replaced by the sum of that equation and the first equation multiplied by -6. The solution to system B will not be the same as the solution to system A.
C.
To get system B, the second equation in system A was replaced by the sum of that equation and the first equation multiplied by 5. The solution to system B will be the same as the solution to system A.
D.
To get system B, the second equation in system A was replaced by the sum of that equation and the first equation multiplied by 3. The solution to system B will be the same as the solution to system A.
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Ответ:
3x + 5 / 2 = 7
3x +5 = 7 x 2
3x + 5 = 14
3x = 14 - 5
3x = 9
x = 9/3
x = 3