System of equations

1.) Solve the following systems by graphing.

5y-15x=0

x+2y=7

2.) 2x-y=9

6x-3y=9

3.) Solve the system of equations by the elimination method.

-x+14y=27

x+14y=36

4.) 4x+y=11

x-2y=5

5.) 3x+y=5

3y=15-9x

6.) Solve the following system of equations by substitution or elimination.

16x+4y=15

4x+y=-6

7.) 3x-4y=17

8x-5y=51

8.) Use the elimination method to solve the following systems of equations.

4x-3y=-9

-3x+2y+5

9.) Solve the system of equations by the elimination method.

5/4x + 3/2y=8

1/8x- 3/4y =-1

10.) Solve the following system of equations by substitution or elimination

0.3x-0.8y=1.4

0.5x-y=-2.0

11.) Solve the following system of equations.

x-y+z=-7

4x+2y-z=10

-2x+4y-z=32

12.) x+y =2

6y=30

3x+4y-2z=7

13.) 2x+4y+z=0

-x+2y+3z=-2

x+2y+z=-2

14.) 2x+4y+z=0

-x+2y+3z=-2

x+2y+z=-2

15.) 5x+5y-20z=5

5x+y-z=9

-x-y+4z=3

16.) 4x-2y+2z=20

2x-6y+4z=18

6x+12y-3z=-6

17.) x+2y-z=10

-3x-2y-3z=8

4x+4y+5z=-16

18.) x+4z=0

7x+y=0

y-5z=0