Question

Diketahui sistem persamaan linear 5x - 4y = -1 dan 10x + 2y = 3 penyelesaian sistem persamaan tersebut adalah......

A.x =5 dan y = 2
B.x =5 dan y =1/2
C.x =1/2 dan y = 1/5
D.x =1/5 dan y = 1/2

Answer 1

Verified answer

5x - 4y = -1
10x + 2y = 3

eliminasi
5x - 4y = -1
20x + 4y = 6
----------------- (+)
25x = 5
x = 1/5

subtitusi
5x - 4y = -1
5(1/5) - 4y = -1
1 - 4y = -1
4y = 1 + 1
4y = 2
y = 2/4
y = 1/2

Answer 2

5x-4y= -1
10x+2y=3
penyelesaian
eliminasi y
5x-4y= -1 [x2] 10x-8y=-2
10x+2y=3. [x4] 40x+8y=12 +
50x. =10
x=10/50
x = 1/5
eliminasi y
5x-4y=-1 [10] 50x-40y=-10
10x+2y=3. [5] 50x+10y=15. -
-50y=-25
y=-25/-50
y=1/2
jawabannya C
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