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(1,10) --> (x2,y2)
y-y1/y2-y1 = x-x1/x2-x1
y-4/10-4 = x-(-2)/1-(-2)
y-4/6 = x+2/3
3.(y-4) = 6.(x+2) (bagi 3 kedua ruas)
y-4 = 2.(x+2)
y-4 = 2x+4
y = 2x+4+4
y = 2x+8
(3,p) --> y = 2x+8
p = 2.3+8
p = 6+8
p = 14