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12. y-y1=m·(x-x1)
y-2=3(x-4)
y-2=3x-12
y=3x-12+2
y=3x-10
y-y1 = m (x-x1)
y-2 = 3 (x-4)
y-2 = 3x - 12
y = 3x-12+2
y= 3x-10
13.) y-y1 = x-x1
y2-y1 x2-x1
y-3 = x-2
7-3 4-2
y-3 = x-2
4 2
2(y-3) = 4 (x-2)
2y-6 = 4x-8
2y = 4x-8+6
2y = 4x-2
1/2(2y) = 1/2 (4x-2)
y = 2x-1
Gradien (m) = 2