9x + 4y = 7
6x - 4y = 2

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27-02-2015
Mathematics

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9x + 4y = 7
6x - 4y = 2

Sagot :

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Анонимidn Анонимidn · Answer 1 · 2015-02-27T02:21:53-05:00

Анонимidn Анонимidn

27-02-2015

I used the elimination method:

Multiply 9x+4y=7 by 2: 18x+8y=14
Multiply 6x-4y=2 by 3: 18x-12y=6

{18x+8y=14}
{18x-12y= 6}

18x-12y=6
-
18x+8y=14
_____________
-20y= -8

{18x + 8y = 14}
{-20y= -8}

Isolate y
y= 2/5 For 18x+8y=14 plug in y=2/5
Sovle 18x+8(2/5)=14 for x: x=3/5

THE SOLUTIONS FOR THE SYSTEMS OF EQUATIONS ARE:
y= 2/5, x=3/5

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Sagot :

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