Tuliska persamaan linear tentukan metode grafik,substitusi,dan eliminasi berikut:

Subtitusi
x – 2y = 7
2x – 3y = 9

x – 2y = 7
x = 7+2y
2x – 3y = 9
2(7+2y) – 3y = 9
14 + 4y – 3y = 9
14 +y =9
y = 9-14
y = -5

x-2y = 7
x-2(-5)=7
x+10=7
x=7-10
x= -3

eliminasi
x – 2y = 7 | x 2|=2x – 4y = 14
2x – 3y = 9 | x 1| = 2x – 3y = 9
_________-
– y = 5
y = – 5

x – 2y = 7 | x -3|= -3x + 6 = -21
2x – 3y =9|x -2|= -4x + 6 = – 18
___________-
x = -3