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m = -a/b = -4 / 5
m1 = m2
-4/5 = m2
y - y1 = m(x-x1)
y - 3 = -4/5 (x - (-1))
y - 3 =-4/5 (x + 1)
5y - 15 = -4 (x+1)
5y - 15 = -4x - 4
4x + 5y - 11 = 0
gradien = m = -a/b
= - 4/5
di titik (-1,3)
y - y1 = m (x - x1)
y - 3 = -4/5 (x + 1)
y - 3 = -4/5x -4/5
4/5x + y = 3 - 4/5
4/5x + y = 11/5 (x5)
4x + 5y = 11
jadi, persamaan garis singgungnya adalah 4x+5y = 11 atau 4x + 5y - 11 = 0