4x-3y=7 3x+2y=1 x=... y=.... menggunakan cara subtitusi

Mapel : Matematika
Kelas : VIII SMP
Bab : SPLDV

Pembahasan :
4x - 3y = 7 |x 3| 12x - 9y = 21
3x + 2y = 1 |x 4| 12x + 8y = 4

Substitusi...
12x = 12x
21 + 9y = 4 - 8y
9y + 8y = 4 - 21
17y = -17
y = -1

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

Hp : {1 , -1}