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2x +y= 5
2x= 5-y
substitusikan 2x ke --> 2x+2y =14
5-y +2y =14
5 +y= 14
y = 14-5
y= 9
2x= 5-y
2x= 5-9
2x= -4
x= -2
y= -2x +5
lalu subtitusikan ke persamaan
2x + 2y = 14
=2x + 2(-2x + 5) = 14
= 2x -4x + 10 = 14
= 2x -4x = 14 - 10
= -2x = 4
x= -2
jadi