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Question

The measure of the angle between the graph of linear equation $35x - 35y + 15 = 0$ and the x-axis is:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
$45^\circ$

Finding the Angle with the X-axis

To find the angle between the graph of a linear equation and the x-axis, we first need to determine the slope of the line. The angle $\theta$ the line makes with the positive x-axis is related to the slope $m$ by the equation $\tan(\theta) = m$. This angle $\theta$ is also called the angle of inclination.

Calculating the Slope

The given linear equation is $35x - 35y + 15 = 0$. We need to rewrite this equation in the slope-intercept form, which is $y = mx + c$, where $m$ is the slope and $c$ is the y-intercept.

  1. Rearrange the equation to isolate the $y$ term:

    $35y = 35x + 15$

  2. Divide both sides by 35 to solve for $y$:

    $y = \frac{35x}{35} + \frac{15}{35}$

    $y = 1x + \frac{3}{7}$

  3. Comparing this with $y = mx + c$, we find that the slope $m = 1$.

Determining the Angle

Now, we use the relationship between the slope and the angle of inclination:

$ \tan(\theta) = m $

Substitute the value of the slope we found:

$ \tan(\theta) = 1 $

To find the angle $\theta$, we take the inverse tangent (arctan) of 1:

$ \theta = \arctan(1) $

The angle whose tangent is 1 is $45^\circ$.

Therefore, the measure of the angle between the graph of the linear equation $35x - 35y + 15 = 0$ and the x-axis is $45^\circ$.

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