Jika (x.y) merupakan penyelesaian spldv 2x+4y+12=0 dan 3x+5y+14=0 maka x.y=...

2x + 4y + 12 = 0 >> × 3
3x + 5y + 14 = 0 >> × 2
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6x + 12y + 36 = 0
6x + 10y + 28 = 0
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2y + 8 = 0
2y = -8
y = -8 : 2
y = -4

2x + 4y + 12 = 0
2x + (4 × (-4)) + 12 = 0
2x - 16 + 12 = 0
2x - 4 = 0
2x = 4
x = 4 : 2
x = 2

x . y = x × y
= 2 × (-4)
= -8