4. In order to solve the following system of equations by addition, what could you do before adding the equations so that one variable will be eliminated when you add them?
2x - 4y = 5
6x = 3y = 10
Multiply the top equation by -3.
Multiply the top equation by -2.
Multiply the top equation by 3 and the bottom equation by 4.
Multiply the top equation by -3 and the bottom equation by 2.
PLEASE HELP !?
2016-07-07 4:59 pm
回答 (1)
2016-07-07 5:04 pm
✔ 最佳答案
2x - 4y = 5 6x + 3y = 10
6x - 12y = 15
15y = -5
y = -1/3
Solution:
x = 11/6, y = -1/3
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