Question

2x + 2y = 160
x = y + 20
tentukan hasil SPLDV di atas dengan metode subtitusi

Answer 1

2(y + 20) + 2y = 160
2y + 40 + 2y = 160
4y = 160-40
y = 120 : 4
y = 30

x = y + 20
x = 30 + 20
x = 50

Answer 2

2x + 2y =160 x =y + 20

x = 20-y
2(20-y)+2y =160
40-2y-1y = 160
40-3y = 160
3y = 160- 40
3y = 120
y = 120
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3
y= 40 x =20- y
x= 20-40
x= -20