Another HW Elimination method Algbrea Word Problem Grade 8

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3] x-y=2        4] 6x+5y=4        5. 2x-3y=12    6 3x+2y=0  7. 2x+3y=6  8. 3x-y=2  9. 4x+5y=6      10.4x+2y=8

   x+y= -3          6x-7y=20           4x+3y=24      x-5y=17      x+2y=5       x+2y=3      6x-7y=-20        16x-y=14

Nov 20th, 2014

3. x-y =2 ;x+y =-3 

2x= -1  ;  X= -1/2 ; y = -5/2

x = -1/2 ; y = -5/2

4. 6x+5y =4 ; 6x-7y =20

Subtracting 12y = -16  ; Y = -16/12 = -4/3 ;   y= -4/3

6x-20/3 =4

6x= 4+20/3 = 32/3 ;X = 32/18 = 16/9 ; x = 16/9

5. 2x-3y =12 ; 4x+3y =24;

 Adding 6x = 36 ; x =6 ; 24+3y =24 ; 3y =0 ; y=0

6. 3x+2y =0

  3x-15y =51

  17y =-51 ; y =-3; 3x-6 =0 ; 3x =6 ; x= 2

7.

2x+ 3y =6 

X+2y =5

2x+4y =10

2x+3y =6

y =4 ; x+8 =5 ; x =5-8 = -3 ; x = -3


8.

3x-y =2

X+2y=3

6x-2y =4

7x = 7

X=1 ; 3-y=2 ; y =3-2 =1 ; y=1


9.

4x+5y=6

6x-7y =-20

12x+15y =18

12x-14y = -40

29y = 58

Y = 2 ; 4x+10 =6 ; 4x = -4 ; x =-1



10.

4x+2y =8

16x-y =14

16x+8y = 32

-9y =-18 ; y =2

4x+4 =8

4x = 8-4 = 4; x = 1


Nov 20th, 2014

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