Question

Tìm giá trị nguyên dương nhỏ hơn 10 của x và y sao cho 3x-4y= - 21

Answer 1

                                                     

                                             3x-4y=-21suy ra3x=4y-21

                                         3x=3y-21+y;x=(3y-21+y):3;x=y-7+y:3

   Vì x,y là số nguyên dương nhỏ hơn 10 nên y chia hết cho 3 suy ra y thuộc {6;9}.

   Với y=6 thì x = 1

   Với y =9 thì x = 5

Answer 2

Làm chẳng ra gì . Bố méo thèm chép.

Answer 3

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Answer 4

y = 6 và x = 1

y = 9 và x = 5

Answer 5

y=6 và x=1

y=9 và x=5

các bạn nhớ k cho mình nha mình đang bị âm điểm ^_^

Answer 6

y = 6 và x = 1

y = 9 và x = 5

Answer 7

3x+7=28

3x    =28-7

3x     =21

  x    =21:3

 x      =7