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Answer:
A and C
Step-by-step explanation:
A) y = (1/2)x + 2 {Compare with y =mx +b}
slope = (1/2)
C) y = -2x + 4
Slope = -2
[tex]\dfrac{1}{2}*-2 = -1[/tex]
When product of two slopes is (-1), then the lines are perpendicular.