Titik (1,-2)dan titik (3,-1)membentuk persamaan garis lurus??

y - y1/ y2 - y1 = x - x1 / x2 - x1
y - (-2) / -1 - (-2) = x - 1 / 3 - 1
y + 2 / -1 + 2 = x - 1 / 2
y + 2 / 1 = x - 1 / 2
2 (y + 2) = x - 1
2y + 4 = x - 1
2y - x + 4 + 1 = 0
2y - x + 5 = 0