From the following list of equations, choose the equation which represents a straight line.
y = 2x - 1, x^3+3x+5=0, 2y - x = 5
Both `y = 2x - 1` and `2y - x = 5` are equations of a straight lines.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
From the following list of equations, choose the equation which represents a straight line.

### Response:
Both `y = 2x - 1` and `2y - x = 5` are equations of a straight lines.