Question

{5x+4x=37
{10x+y=29
$5x + 2y = 21 \\ 10x + y = 18$
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Answer 1

Resposta:

5x+4y=37

10x+y=29 x(-4)

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5x+4y=37

-40x-4y=- 116

-35x = -79

x= -79/-35

x= 79/35

5(79/35)+4y=37

395/35+4y= 37

395+140y= 1295

140y= 1295-395

140y= 900

y= 900/140

y= 450/70

y= 225/35

y= 45/7

S={(79/35,45/7}

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b)5x+2y=21

10x+y=18x(-2)

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5x+2y=21

-20x-2y= -36

-15= -15

x= -15/-15

x= 1

5*1+2y= 21

5+2y= 21

2y= 21-5

y= 16/2

y=8

S= {(1,8)}