Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Create a new line plotting the 2nd column of input data against the first column.

### Input:
1 4 7
2 5 8 
3 6 9

### Response:
import matplotlib.pyplot as plt

x = [1, 2, 3]
y = [4, 5, 6]

plt.plot(x, y)
plt.xlabel('x')
plt.ylabel('y')
plt.title('Line Graph')
plt.show()