Suatu garis lurus ax + by = 9 melalui titik (1,2) dan (3,-3). Nilai b - a = .....

Persamaan LInier

ax + by = 9
.
(1,2)--> a(1) + b(2)= 9 --> a + 2b = 9
(3,-3)--> a(3) +b(-3)= 9--> 3a - 3b = 9
atau a - b = - 3
atau b - a = 3