Jwb SPLDV 2x+10y =10&5x+7y=15 dgn cara eliminasi dan campuran

jawab

cara eliminasi
2x + 10 y = 10 ..|X5
5x + 7y = 15......|X2

10x + 50y = 50
10x + 14y = 30..|(-)
36y = 20
y = 20/36
y = 5/9

2x + 10y = 10..|X7
5x + 7y = 15....|X10

14 x + 70 y= 70
50x + 70y = 150 ..|(-)
-36 x =  -80
x = -80/-36 = 20/9

cara campuran (eliminasi dan substitusi)

2x + 10y = 10...|X5
5x + 7y =  15....|X2

10x + 50y = 50
10x  +14y = 30 ..|(-)
36y = 20
y  = 20/36
y = 5/9
substitusi ke 5x + 7y = 15
5x + 7(5/9) = 15
5x  + 35/9 = 15
5x = 15 - 35/9
5x = 100/9
x= 100/45
x = 20/9

semoga membantu..
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