更新1:
Solve the following system of equations. y = -3x -6x - 3y = 6 a) (-3, 4) b) (6, -2) c) (2, -6) I came up with c. (2, -6). Am I right?
Solve the following system of equations. y = -3x -6x - 3y = 6 a) (-3, 4) b) (6, -2) c) (2, -6)?
回答 (2)
2015-09-01 5:34 pm
y = -3x ...... [1]
-6x - 3y = 6 ...... [2]
Put [1] into [2] :
-6x - 3(-3x) = 6
-6x + 9x = 6
3x = 6
x = 2
Put x = 2 into [1] :
y = -3(2)
y = -6
c) (2, -6) is the correct answer.
-6x - 3y = 6 ...... [2]
Put [1] into [2] :
-6x - 3(-3x) = 6
-6x + 9x = 6
3x = 6
x = 2
Put x = 2 into [1] :
y = -3(2)
y = -6
c) (2, -6) is the correct answer.
2015-09-01 4:54 pm
since y=-3x, -6x-3y=6 is:
-6x-3(-3x)=6
-6x+9x=6
3x=6
x=2, and since y=-3x, y=-6
-6x-3(-3x)=6
-6x+9x=6
3x=6
x=2, and since y=-3x, y=-6
收錄日期: 2021-05-01 13:05:34
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