persamaan grs lurus yg melalui titik A(3,-5)dgn gradien -1/2 adl... pkai cranya

y - y1 = m (x - x1)
y - (-5) = -1/2 (x - 3)
y + 5 = -1/2x + 3/2
----------------------------- × 2
2y + 10 = -x + 3
x + 2y + 10 - 3 = 0
x + 2y + 7 = 0