Question

Which equation represents a linear function?

Equation 1: y = 2x^2 + 1
Equation 2: y^2 = 3x + 1
Equation 3: y = 5x - 1
Equation 4: y = 4x^4 - 1

Answer 1

Equation 3: y = 5x - 1

Equations with powers in them are not linear.