Another HW Elimination method Algbrea Grade 8

Mathematics
Tutor: None Selected Time limit: 1 Day

  -4x-15y=-17  -x-7y=14       -7x-8y=9        5x+4y=-30    -4x-2y=14        3x-2y=2    

  -x+5y=-13    -4x-14y=28   -4x+9y= -22    3x-9y=-18     -10x+7y= -25   5x-5y=10

Nov 20th, 2014

-4x-15y=-17

-x+5y=-13

-4x+20y = -52

-4x-15y = -17

Subtracting

35y = -35

y = -35/35 =-1

-x-5 =-13 ; -x = -13+5 = -8

x = -8

x= -8 ; y = -1

-x-7y=14      

4x-14y=28  

-2x-14y = 28

6x =0

x=0  

-7y =14 ; y =14/(-7) = -2

x=0 ; y = -2

-7x-8y=9      

-4x+9y= -22    

-28x-32y = 36

-28x+63y = -154

95y = -190

y = -190/95 =-2

-7x+16 = 9

-7x =9-16 = -7

x =1

x=1 ; y = -2

5x+4y=-30    

3x-9y=-18    

x-3y =-6

5x-15y =- 30

5x+4y =-30

Subtracting

19y =0

y =0 ; 5x=30 ; x=6

x=6 ; y=0

-4x-2y=14      

-10x+7y= -25  

-2x-y=7

-14x-7y =49

-10x+7y = -25

-24x = 24 ; x =-1 ; 4-2y =14 ; -2y =14-4 =10 ; y = -5

x= -1 ; y = -5

3x-2y=2

5x-5y=10

x-y =2

2x-2y =4

3x-2y =2

x =-2 ; -2-y =2 ;- y =2+2 =4 ; y = -4

x= -2 ; y =-4


Nov 21st, 2014

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