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Komok [63]
4 years ago
8

X+7=2y+1 3x-y=7 solve for x and y

Mathematics
1 answer:
vovangra [49]4 years ago
6 0

{x+7=2y+1    ⇔  x-2y=1-7   ⇔ x-2y=-6

{3x-y=7     /*(-2)

{x-2y=-6

<u>{-6x+2y=-14      </u>(+)

<em>x-6x-2y+2y=-6-14</em>

<em>-5x=-20     </em>/:(-5)

x=4

x -2y=-6

4-2y=-6       /-4

-2y=-10     /:(-2)

y=5

<em>Solution: (4; 5)</em>



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