Question

Rezolvati sistemul: 4•(2x-3)+11y=1
7•(x-1)=2y+16
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Answer 1

Răspuns:

Explicație pas cu pas:

8x - 12 + 11y = 1

7x - 7 = 2y + 16

_____

8x + 11y = 13

7x - 2y = 23

_____

16x + 22y = 26

77x - 22y = 253 adunam cele doua ecuatii

93x = 279

x = 279 : 93 = 3

7*3 - 2y = 23

21 - 2y = 23

2y = 21 - 23 = -2

y = -1

Answer 2

Răspuns:

4•(2x-3)+11y=1 => 8x-12+11y=1 =>8x+11y=1+12 =>8x+11y=13

7•(x-1)=2y+16 => 7x-7=2y+16 => 7x-2y=16+7 =>7x-2y=23

__________

8x+11y=13 I·2

7x-2y=23 I · 11

____________

16x+22y=26

77x-22y=253

_______________

93x=279=>x=279:93=>x=3

7x-2y=23 =>7·3-2y=23 =>-2y=23-21=>y=-2:2=>y=-1