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Question

The intercepts made by the plane $3x - 4y - 2z = 6$ with the coordinate axis are:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
2, $-\frac{3}{2}$, -3

Finding Plane Intercepts

To find the intercepts of the plane $3x - 4y - 2z = 6$ with the coordinate axes, we need to convert the equation into the intercept form: $\frac{x}{a} + \frac{y}{b} + \frac{z}{c} = 1$. Here, $a$, $b$, and $c$ represent the x, y, and z intercepts, respectively.

Equation Conversion

First, divide the given equation $3x - 4y - 2z = 6$ by 6 to make the right-hand side equal to 1:

$ \frac{3x}{6} - \frac{4y}{6} - \frac{2z}{6} = \frac{6}{6} $

Simplify the fractions:

$ \frac{x}{2} - \frac{y}{\frac{6}{4}} - \frac{z}{\frac{6}{2}} = 1 $

$ \frac{x}{2} - \frac{y}{\frac{3}{2}} - \frac{z}{3} = 1 $

Identifying Intercepts

Rewrite the equation to match the standard intercept form $\frac{x}{a} + \frac{y}{b} + \frac{z}{c} = 1$. We adjust the signs in the denominators:

$ \frac{x}{2} + \frac{y}{-\frac{3}{2}} + \frac{z}{-3} = 1 $

By comparing this with the standard form, we can identify the intercepts:

  • x-intercept ($a$): 2
  • y-intercept ($b$): $-\frac{3}{2}$
  • z-intercept ($c$): -3

Conclusion

The intercepts made by the plane $3x - 4y - 2z = 6$ with the coordinate axes are 2, $-\frac{3}{2}$, and -3.

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Similar Questions

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  2. Find the area of a triangle formed by $(1, 0)$, $(-1, 0)$, $(0, 1)$.
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  5. The image of the point $(7, 8)$ when reflected along the x-axis is:
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Important Questions from Coordinate Geometry

  1. What is the reflection of the point (-1, 5) in the line x = 1?

  2. What are the co-ordinates of the centroid of a triangle, whose vertices are A(1, -5), B(-4, 0) and C(3, -4)?

  3. Slope of the line AB is 4/3. Co-ordinates of points A and B are (x, -5) and (2, -3) respectively. What is the value of x?

  4. Find the co-ordinates of the centroid of a triangle whose vertices are A(1, 4), B(7, 8) and C(10, 12).

  5. If x² + y² - 12x + 18y + 117 = 0, then the value of x² + y² is:
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