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Which equation represents a linear function? (1 point)

Equation 1: y = 2x2 + 1
Equation 2: y2 = 3x + 1
Equation 3: y = 5x3 − 1
Equation 4: y = 4x − 1

A)Equation 1
B)Equation 2
C)Equation 3
D)Equation 4