which table represents a linear function?
a.
x 1 2 3 4 5
y 5 10 15 20 25
b.
x 1 2 3 4 5
y 5 20 45 80 125
c.
x 1 2 3 4 5
y 5 25 125 625 3125
d.
x 1 2 3 4 5
y 2 4 8 16 32

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