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= 2 - 5 / 10 - 7
= - 3 / 3
= - 1
y - y1 = m (x - x1)
y - 5 = -1 (x- 7)
y - 5 = -x + 7
y = -x + 12
atau bisa juga
y + x = 12
atau
y + x - 12 = 0
m = -1
y = -x - ( -7 - 5 )
y = -x + 12
x + y = 12