Which equation represents a linear function?

Equation 1: y = 2x2 + 1
Equation 2: y2 = 3x + 1
Equation 3: y = 5x − 1
Equation 4: y = 4x4 − 1

Question

Which equation represents a linear function?

Equation 1: y = 2x2 + 1
Equation 2: y2 = 3x + 1
Equation 3: y = 5x − 1
Equation 4: y = 4x4 − 1

anonymous · Answer

Linear functions have straight lines.

anonymous · Answer

anonymous · Answer

Which one is straight?

nathaliama13 · Answer

@iGreen but how should I know if they are straight if the answer does not show a graph to let me know?

nathaliama13 · Answer

@iGreen.  Nevermind. thank you ☺

nathaliama13 · Answer

@iGreen.  it's function 3 :)

anonymous · Answer

Yes, here's a tip, it shouldn't have any exponents in it.

anonymous · Answer

Exponents are those small numbers at the top, if you're wondering.

nathaliama13 · Answer

Thank you. i'll keep that in mind. I know what exponents are haha.

anonymous · Answer

Okay, just making sure..lol some people on here don't.