tentukan penyelesaian dari

Mapel : Matematika
Kelas : VIII SMP
Bab : SPLDV

Pembahasan :
5x - 4y = 18 —» 20x - 16y = 72
-4x - 7y = 42 —» -20x - 35y = 210

Eliminasi...
20x - 16y = 72
-20x - 35y = 210
—————————— (+)
-51y = 282
y = -282/51

Substitusi...
5x - 4y = 18
4y = 5x - 18
4(-282/51) = 5x - 18
-1128/51 = 5x - 18
5x = -1128/51 + 918/51
5x = -210/51
x = -42/51

Hp : {-42/51 , -282/51}

————————————————
x + y = 10
6x + 3y = 18 —» 2x + y = 6

Eliminasi...
2x + y = 6
x + y = 10
—————— (-)
x = -4

Substitusi...
x + y = 10
-4 + y = 10
y = 14

Hp : {-4 , 14}

————————————————
2x + y = 16
4x + 3y = 12

Liat gambar...