Question

{3x+4y=15 {6x-16u=2,25

Answer 1

3x + 4y = 15     / *(-2)

6x - 16y = 2,25

 

-6x - 8y = -30

6x - 16y = 2,25

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-24y = - 27,75

y = -27,75 : (-24)

y = - 27 i 3/4 : (-24)

y = - 111/4 * (-1/24)

 

y = 111/96

y = 1 i 15/96

y = 1 i 5/32

 

3x + 4y = 15

3x + 4 * 111/96 = 15

3x = 15 - 111/24

3x = 360/24 - 111/24

3x = 249/24

x = 249/24 * 1/3

x = 249/72

x = 3 i 33/72

x = 3 i 11/24

 

x = 3 i 11/24

y = 1 i 5/32