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aleksklad [387]
4 years ago
8

3x+4y=2 4x-4y=12 elimination

Mathematics
2 answers:
nirvana33 [79]4 years ago
8 0
3x+4y=2
4x-4y=12
Add both
7x=14
X=2
Substitute value of x in first equation
Y=-1
Advocard [28]4 years ago
4 0
    3x+4y=2
 + 4x-4y=12         add them since 4y and -4y can cancel out
    7x=14              divide each side by 7
      x=2 

3x+4y=2   x=2
3(2)+4y=2        substitute 
  6+4y=2
-6       -6
      4y=-4        divide each side by 4
        y=-1
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<em>x </em><em>(</em><em> </em><em>x </em><em>-</em><em> </em><em>5</em><em>)</em><em> </em><em>+</em><em> </em><em>4</em><em> </em><em>(</em><em> </em><em>x </em><em>-</em><em> </em><em>5</em><em>)</em><em> </em><em>=</em><em> </em><em>0</em>

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<em>Either</em><em>. </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em>

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<em>x </em><em>=</em><em> </em><em>5</em>

<em>Or, </em>

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<em>x </em><em>=</em><em> </em><em>-</em><em>4</em>

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