20. (0, -2), (3, 1)
(1+2)/(3-0)= 3/3= 1
y + 2= x - 0
y= x - 2
21. (0,4), (4, 2)
(2-4)/(4-0)= -2/4= -1/2
y - 4 = -1/2(x - 0)
y - 4 = -1/2x + 0
y= -1/2x + 4
22. (0, 1), (2, -3)
(-3-1)/(2-0)= -4/2= -2
y - 1 = -2(x - 0)
y - 1= -2x + 0
y = -2x + 1
23. (0, -3), (2, 1)
(1 + 3)/(2 - 0)= 4/2= 2
y + 3 = 2( x - 0)
y + 3 = 2x - 0
y = 2x - 3
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