spldv 3x+y=-2,-2x+3y=5

jawab

3x + y = - 2.....kali 3
-2x + 3y = 5

9x+ 3y = - 6
-2x + 3y = 5.....(-)
11x = - 11
x = -1

-2x + 3y = 5
2 + 3y = 5
3y = 3
y = 1

(x,y)=(-1, 1)

M. Substitusi
3x+y=-2...1=>y=-2-3x
-2x+3y=5

-2x+3(-2-3x)=5
-2x-6-9x=5
-2x-9x=5+6
-11x=11
x=-1

y=-2-3x
y=-2-3(-1)
y=-2+3
y=1

HPB:{-1,1}
M. eliminasi
Elim x
3x+y=-2/×2 =>6x+2y=-4
-2x+3y=5/×3 =>-6x+9y=15

6x+2y=-4
-6x+9y=15
________+
11y=11
y=1


Elim y
3x+y=-2/×3 =>9x+3y=-6
-2x+3y=5/×1 =>-2x+3y=5

9x+3y=-6
-2x+3y=5
________-
11x=-11
x=-1

HPB:{-1,1}

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