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Verified answer
Diketahuim1 = -2/3
syarat tegak lurus
m1 . m2 = -1
-2/3 . m2 = -1
m2 = 3/2
jadi pers. garis yang memiliki gradin 3.2 dan melewati (5,-3) adalah
y + 3 = 3/2(x - 5)
y + 3 = 3x/2 - 15/2
2y + 6 = 3x - 15
2y - 3x + 21 = 0
atau
3x - 2y - 21 = 0