**Explanation:**

To understand why the positive solution of the equation ax + by + c = 0 always lies in the first quadrant, let's break down the equation and analyze the possibilities for the values of a, b, and c.

**1. Equation Analysis:**
The equation ax + by + c = 0 represents a linear equation in two variables x and y. Here, a, b, and c are constants.

**2. Quadrants Overview:**
In the coordinate plane, there are four quadrants numbered from 1 to 4 in an anti-clockwise direction. The first quadrant is in the top-right, the second quadrant is in the top-left, the third quadrant is in the bottom-left, and the fourth quadrant is in the bottom-right.

**3. Positive Solution:**
The positive solution of an equation refers to the values of x and y that satisfy the equation and are positive numbers.

**4. Analyzing the Equation:**
Let's consider the given equation ax + by + c = 0.

- If both a and b are positive, then for the equation to hold true, x and y must also be positive. Therefore, the positive solution lies in the first quadrant.
- If both a and b are negative, then for the equation to hold true, x and y must be negative. Therefore, the positive solution does not exist in any quadrant.
- If a is positive and b is negative, then for the equation to hold true, x must be positive and y must be negative. Therefore, the positive solution does not exist in any quadrant.
- Similarly, if a is negative and b is positive, then for the equation to hold true, x must be negative and y must be positive. Therefore, the positive solution does not exist in any quadrant.

**5. Conclusion:**
From our analysis, we can conclude that the positive solution of the equation ax + by + c = 0 always lies in the first quadrant (option B) when both a and b are positive values.

Yes it will be 1 st quadrant becoz ax+by+c=0 all are positive numbers