lilpump3506
13.03.2020 •
Mathematics
O solve this system of equations by elimination, what operation could be used to eliminate the x-variable and find the value of y?
−6x − 4y = 2
−4x − 7y = 2
A) subtract 3 times the second equation from 2 times the first equation
B) subtract 2 times the second equation from 3 times the first equation
C) add 3 times the second equation to 2 times the first equation
D) add 2 times the second equation to 3 times the first equation
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Ответ:
2a + b = 10
b = 10 - 2a
a + 2(10 - 2a) = 8
a + 20 - 4a = 8
-3a = -12
a = 4
4 + 2b = 8
2b = 4
B = 2