Solve the system using substitution.
5x - 3y = -4
x + y = -4
A. no solution
B. (-2,-2)
C. (-2,-3)
D. infinitely many solutions
E. (2,5)
easy math?
2008-03-25 4:11 am
回答 (5)
2008-03-25 4:15 am
✔ 最佳答案
Yep. Just as I predicted. Posting tons of nearly-identical questions, instead of learning the method from one answer so that you can do the rest. Here's are all the different ways of solving sets of linear equations. Not that you'll actually read it:
http://mathforum.org/library/drmath/view/61608.html
And usual, you probably won't give out a "best answer" to anybody, since glancing at your past questions it seems that you never do.
2008-03-25 11:23 am
5(-4-y)-3y=-4
-20-5y-3y=-4
-8y=-4+20
-8y=16
y=-2
x+(-2)=-4
x=-4+2
x=-2
the answer is B.(-2,-2)
-20-5y-3y=-4
-8y=-4+20
-8y=16
y=-2
x+(-2)=-4
x=-4+2
x=-2
the answer is B.(-2,-2)
2008-03-25 11:23 am
B
(-2, -2)
(-2, -2)
2008-03-25 11:18 am
5(-y-4)-3y=-4
-5y-20-3y=-4
-8y-20=-4
-8y=16
y=-2
5x-3(-2)=-4
5x+6=-4
5x=-10
x=-2
y=-2
b
-5y-20-3y=-4
-8y-20=-4
-8y=16
y=-2
5x-3(-2)=-4
5x+6=-4
5x=-10
x=-2
y=-2
b
2008-03-25 11:15 am
e
收錄日期: 2021-05-03 13:56:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080324201154AAOLx1g