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m = -a/b = -1/2
pers garis melalui titik (-1,5) dgn m = -1/2
y-y1 = m(x-x1)
y-5 = -1/2(x+1) --> kedua ruas dikali 2
2y-10 = -1 (x+1)
2y-10 = -x-1
x+2y-10+1 = 0
x+2y-9 = 0
semoga membantu ya :)