Question

Metode grafik
metode subtitusi
metode eleminasi
metode campuran
soal :
x + 2y = 10
2x - y = 5
jawablah dengan menggunakan ke 4 metode tersebut

Answer 1

# subtitusi
x + 2y=10
2x - y= 5
▶x + 2y =10
x= 10 - 2y
▶ 2x -2y = 5
2(10 -2y ) - y = 5
20-4y-y=5
20-5y=5
-5y=5-20
-5y=-15
y=-15/-5
y=3
▶ x+2y=10
x+2(3)=10
x=10-6
x=4
# eliminasi
x+2y=10 | 2》 2x + 4y = 20
2x-y=5 |1》 2x - y = 5
_____________ -
5y = 15
y = 15/5
y = 3
x+2y=10 | 1》 x + 2y = 10
2x-y=5 | 2》 4x - 2y = 10
__________ +
5x = 20
x = 20/5
= 4
# campuran
x+2y = 10 | 1 》 x+2y = 10
2x-y = 5 | 2 》 4x - 2y = 10
__________+
5x = 20
x = 20/5
x = 4
x+2y=10
4 + 2y = 10
2y = 10-4
y = 6/2
y = 3
Hp = { 4, 3 }