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Solve the system by elimination

⎪-2x+2y+3z=0
⎨-2x-y+z=-3
⎪2x+3y+3z=5


Sagot :

The solution to the system of equations using elimination method is (1, 1, 0)

Given the system of equations;

-2x+2y+3z=0 ............. 1

-2x-y+z=-3 .............2

2x+3y+3z=5 ...............3

Subtracting 1 from 2 will give;

2y+y + 3z-z = 0-(-3)

3y + 2z  = 3 ...................... 4

Add equation 2 and 3

-y + 3y + z + 3z = -3 + 5

2y+4z = 2

y+2z = 1 .............. 5

Solve 4 and 5 simultaneously:

3y + 2z  = 3 .......... 4

y+2z = 1 .............. 5

Subtract 4 from 5 to have:

3y - y = 3 - 1

2y = 2

y = 1

Since y + 2z = 1

1 + 2z = 1

2z = 0

z = 0

Substitute y = 1 and z = 0 into the equation 2:

Recall from 2;

-2x - y + z = -3

-2x - 1 = -3

-2x = -3 + 1

-2x = -2

x = 1

Hence the solution to the system of equations is (1, 1, 0)

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