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2013-04-29T17:18:46+02:00

5(x-1)-(2x-1) = 3-x

5x-5-2x+1 = 3-x

3x-4 = 3-x

4x =7

x = 7/4

 

4(2x-5)<2x+5

8x-20<2x+5

6x<25

x<25/6

 

3x-2y=8

x+4y=2

 

6x-4y=16

x+4y=2

 

=> 7x = 18

 

7x=18

x+4y = 2

 

x=18/7

18/7 + 4y = 2

 

x=18/7

4y = 2 - 18/7

 

x=18/7

4y = 14/7 - 18/7

 

x = 18/7

4y = -4/7

 

x=18/7

y = -4/7 * 1/4

 

x=18/7

y= -1/7