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miskamm [114]
3 years ago
6

3x+y=5 , 2x-2y=22 solve the system of equations by the addition method

Mathematics
2 answers:
IgorLugansk [536]3 years ago
5 0

<span><em />
3x+y=5</span>

<span /><span>2x-2y=22 ...............2(x-y)=22 ⇒ x-y=11</span><span><em /></span>

<span><em>3x+y=5</em></span>

<span /><span><em><u>x-y=11                   </u> </em>(+)</span>

<span />3x+x+y-y=11+5

<span>4x=16  /:4</span>

<span /><em>x=4</em>

x-y=11

4-y=11

-y=7 /*(-1)

<em>y=-7</em>


<span><em></em></span>

vitfil [10]3 years ago
4 0
3x+y=5\\&#10;2x-2y=22\\\\&#10;3x+y=5\\&#10;\underline{x-y=11}\\&#10;4x=16\\&#10;x=4\\\\&#10;4-y=11\\&#10;-y=7\\&#10;y=-7\\\\&#10;\boxed{(x,y)=(4,-7)}&#10;
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