# Python: Check whether two given lines are parallel or not

## Python Basic - 1: Exercise-103 with Solution

Write a Python program to check whether two given lines are parallel or not.

Note: Parallel lines are two or more lines that never intersect. Parallel Lines are like railroad tracks that never intersect.

The General Form of the equation of a straight line is: ax + by = c

The said straight line is represented in a list as [a, b, c]

Example of two parallel lines:

x + 4y = 10 and x + 4y = 14

**Sample Solution**:

**Python Code:**

```
# Define a function named parallel_lines that takes two lines represented by lists (line1 and line2) as arguments.
def parallel_lines(line1, line2):
# Check if the slopes of the two lines are equal.
# The condition line1[0]/line1[1] == line2[0]/line2[1] compares the slopes of the lines.
return line1[0]/line1[1] == line2[0]/line2[1]
# Test the function with different lines represented by lists and print the results.
# Test case 1
# 2x + 3y = 4, 2x + 3y = 8
print(parallel_lines([2,3,4], [2,3,8]))
# Test case 2
# 2x + 3y = 4, 4x - 3y = 8
print(parallel_lines([2,3,4], [4,-3,8]))
```

Sample Output:

True False

**Explanation: **

Here is a breakdown of the above Python code:

- Function definition:
- The code defines a function named "parallel_lines()" that takes two lines represented by lists (line1 and line2) as arguments.
- Return Statement:
- The function returns 'True' if the slopes of the two lines are equal, indicating that the lines are parallel.
- Slope comparison:
- The condition line1[0]/line1[1] == line2[0]/line2[1] compares the slopes of the two lines.
- Test cases:
- The function is tested with different lines represented by lists using print(parallel_lines(...)).

**Flowchart:**

**Python Code Editor:**

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