What can be said about a straight line if its slope is zero ?

Explanation

To determine what can be said about a straight line if its slope is zero, we can analyze the properties of lines and their slopes. Here’s a step-by-step solution:

### Step 1: Understanding Slope
The slope (m) of a straight line is defined as the tangent of the angle (θ) that the line makes with the positive direction of the x-axis. Mathematically, it is expressed as:
\[ m = \tan(\theta) \]

### Step 2: Given Condition
In this case, we are given that the slope is zero:
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