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4(1 - 3y) - 5y = - 13
4 - 12y - 5y = - 13
- 17y = - 17
y = 1
x = 1 - 3 = - 2
HP: {(-2,1)}
x + 3y = 1
x = 1 - 3y
Substitusikan x = 1 - 3y ke persamaan (1), sehingga diperoleh:
4x - 5y = - 13
4(1 - 3y) - 5y = - 13
4 - 12y - 5y = - 13
4 - 17y = - 13
- 17y = - 13 - 4
- 17y = - 17
y = 1
Substitusikan y = 1 ke bentuk x = 1 - 3y, sehingga diperoleh:
x = 1 - 3y = 1 - 3(1) = 1 - 3 = - 2
Dengan demikian penyelesaiannya adalah :
(- 2, 1)