persamaan garis yang melalui titirk potong garis 2x+5y=1 dan x-3y=-5 dan sejajar dengan garis 2x-y=15

2x  +  5y =  1
x - 3y = - 5 ...|X2


2x + 5y = 1
2x - 3y = -10
.................(-)
8y =11
y = 11/8

x - 3y =  - 5
x = -5 + 3y
x = - 5 + 3(11/8)
x = - 7/8

garis sejajar  2x - y = 15 melalui (-7/8, 11/8)

2x - y = 2(-7/8) - (11/8)
2x - y = -25/8 ...|X 8
16x - 8y = - 25
16 x - 8y  + 25 = 0