jika x dan y adalah penyelesaian dari sistem persamaan linear 3x + 5y - 4 = 0 dan 2x + 3y - 1 = 0,maka nilai x +2y adalah.........

SPLDV

langsung aja ya

3x + 5y = 4
2x + 3y = 1
___________ __
x + 2y = 3

jd jwbnya 3

3x + 5y - 4 = 0 ⇒ 3x + 5y = 4
2x + 3y - 1 = 0 ⇒ 2x + 3y = 1

3x + 5y = 4  ║×2║  6x + 10y = 8
2x + 3y = 1  ║×3║  6x + 9y = 3
                               __________ -
                                         y = 5

2x + 3y = 1
2x + 15 = 1
2x = -14
x = -7

x + 2y = -7 + 10
          = 3