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Nomor 1 ELIMINASI x + y = 6 x - y = 2 Eliminasi x 2y = 4 y = 2
x + y = 6 x - y = 2 Eliminasi y 2x = 8 x = 4
GRAFIK x + y = 6 misal x = 0 0 + y = 6 y = 6 (0,6) misal y = 0 x + y = 6 x + 0 = 6 x = 6 (6,0) Jadi titik potong persamaan x + y = 6 adalah (0,6) dan (6,0)
x - y = 2 misal x = 0 0 - y = 2 y = -2 (0,-2) misal y = 0 x - y = 2 x - 0 = 2 x = 2 (2,0) Gambar koordinat² di atas, maka HP = {4,2}
ELIMINASI
x + y = 6
x - y = 2
Eliminasi x
2y = 4
y = 2
x + y = 6
x - y = 2
Eliminasi y
2x = 8
x = 4
GRAFIK
x + y = 6
misal x = 0
0 + y = 6
y = 6
(0,6)
misal y = 0
x + y = 6
x + 0 = 6
x = 6
(6,0)
Jadi titik potong persamaan x + y = 6 adalah (0,6) dan (6,0)
x - y = 2
misal x = 0
0 - y = 2
y = -2
(0,-2)
misal y = 0
x - y = 2
x - 0 = 2
x = 2
(2,0)
Gambar koordinat² di atas, maka HP = {4,2}
Nomor 2
ELIMINASI
2p + 3q = 12... persamaan 1
4p - 7q = -2... persamaan 2
Pers 1 kalikan 2
4p + 6q = 24
4p - 7q = -2
Eliminasi p
13q = 26
q = 2
2p + 3q = 12... persamaan 1
4p - 7q = -2... persamaan 2
pers 1 kalikan 7, pers 2 kalikan 3
14p + 21q = 84
12p - 21q = -6
Eliminasi q
26p = 78
p = 3
GRAFIK
4p + 6q = 24
misal p = 0
0 + 6q = 24
q = 4
(0,4)
misal q = 0
4p = 24
p = 6
(6,0)
4p - 7q = -2
misal p = 0
-7q = -2
q = 2/7
(0,2/7)
4p - 7q = -2
misal q = 0
4p = -2
p = -2
(-2,0)