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2. 3x=7-2y
- Hilangkan dulu salah satu variabel (misalkan x)
2x - 3y = 7 |x3| ⇒ 6x - 9y = 21
3x + 2y = 7 |x2| ⇒ 6x + 4y = 14 -
-13y = 7
y = -13/7
kita masukkan persamaa y = -13/7 ke salah satu persamaan di atas
2x - 3y = 7
2x - 3 (-13/7) = 7
2x + 39/7 = 7
2x = 7 - 39/7
2x = 49/7 - 39/7
2x = 10/7
x = 10/14