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y = 2x + 6
m = 2
karena tegak lurus, cari m2
m1.m2 = -1
2(m2) = -1
m2 = -1/2
y - b = m(x - a)
y - 2 = -1/2(x - 6)
y - 2 = -1/2x + 3
2y - 4 = -x + 6
2y = -x + 10
atau
x + 2y - 10 = 0
atau
x + 2y = 10