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m₁ = 2 krn tegak lurus maka m₂ = -1/2
persamaan garis melalui (-2,-5) dgn m = -1/2 adlh
y-y₁ = m(x-x₁)
y-(-5) = -1/2(x-(-2))
y+5 = -1/2(x+2) --> kedua ruas kalikan 2
2y+10 = -1(x+2)
2y+10 = -x-2
x+2y+10+2 = 0
x+2y+12 = 0