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5x+y=7 (dikali 2) =>10x+2y=14 ... 2
hasil eliminasi 1 dan 2 : x=2, y=-3
titik potong (p,q) sama dengan (x,y)=> (2,-3)
p=2, q=-3 => 4(2)+3(-3) =8-9 =-1
5x + y = 7 | x 3 | ⇒ 15x + 3y = 21 -
-13y = 39
y = -3
3x - 2y = 12
3x + 6 = 12
3x = 6
x = 2
( 2 , -3 )
4p + 3q =
8 - 9 =