Diketahui 7x+3y-1=0 2x-y-4=0 Mempunyai penyelesaian ((x,y)) nilai x-y ∞

Kelas 8 Matematika
Bab Persamaan Garis

2x - y - 4 = 0
y = 2x - 4

7x + 3y - 1 = 0
7x + 3 (2x - 4) - 1 = 0
7x + 6x - 12 - 1 = 0
13x = 13
x = 1

y = 2x - 4
y = 2 . 1 - 4
y = -2

x - y
= 1 - (-2)
= 3