b.x+4y= -5 2x-y=10 Pakai Jalan Persamaan 2 Variabel Klas Sma 1

Bab Persamaan Linear
Matematika SMA Kelas X

2x - y = 10
y = 2x - 10

x + 4y = -5
x + 4(2x - 10) = -5
x + 8x - 40 = -5
9x = 40 - 5
x = 35/9

y = 2x - 10
y = 2 . 35/9 - 90/9
y = -20/9

HP = {(35/9, -20/9)}

x+4y= -5 => x2
2x-y=10

2x+8y= -10
2x-y=10
----------------- -
.....9y = -20
y = -20/9
y = -2,2

2x-y = 10
2x - (-2,2) = 10
2x+2,2 = 10
x = 10-2,2 / 2
x = 7,8/2
x = 3,9

hp = {3,9 , -2,2}