tolong ya nomor 1-3 pakai cara tentang persamaan garis y=mx+y terima kasih

y = mx + y
1). a). y = 4/5 x + 5
----------------------------------------x 5
< = > 5y = 4x + 25
< = > -4x + 5y - 25 = 0
b). y = - ⅓ x + 5
----------------------------------------x 3
< = > 3y = -x + 15
< = > x + 3y - 15 = 0
c). y = -9 x + 5
< = > 9x + y - 5 = 0

2). y = 3/8x + 11
----------------------------------------x 8
< = > 8y = 3x + 88
< = > -3x + 8y - 88 = 0

3). y - 12x - 10 = 0
< = > y = 12 x + 10 + 0
< = > y = 12x + 10
< = > gradien garis 12
y = 12x + (-19)
< = > y = 12x - 19
< = > -12x + y + 19 = 0

semoga mmebantu^_^