Tag: graphs of linear equations

Questions Related to graphs of linear equations

In the equation $2x - 3y = 12$. The value of $x$ and $y$ that satisfy the equation are-

  1. $(5, 3)$

  2. $(2, 3)$

  3. $(6, 0)$

  4. $(3,12)$


Correct Option: C
Explanation:

Put $\displaystyle x=6$ and $\displaystyle y=0$ in given equation.
$\displaystyle 2x-3y=2\times 6-3\times 0$
=12-0
=12
Hence, the value of x and y that satisfy the equation are (6,0).

The graph of $x =8 $ represents:

  1. line parallel to $y$-axis and at a distance of $8$ units. 

  2. line parallel to $x$-axis and at a distance of $8$ units. 

  3. line parallel to $y$-axis and at a distance of $0$ units. 

  4. None of these


Correct Option: A
Explanation:

The line $x=8$ or a point $(8,0)$ lies on the $x$-axis whwich is parallel to $y$-axis and at a distance of $8$ units.

$(5,0)$ is a point that lies on 

  1. $y$-axis

  2. $x$-axis

  3. $y=x$

  4. $y=5x$


Correct Option: B
Explanation:

Any point on $x$ axis is of the form $(x,0)$ and any point on $y$ axis is of the form $(0,y)$. 

Therefore, $(5,0)$ is a point that lies on $x$ axis.

The graph of $|x| + |y|$ consists of

  1. one straight line

  2. a pair of straight lines

  3. the sides of a square

  4. a circle

  5. a point


Correct Option: C
Explanation:

Given $|x|+|y|$

  1. For $x>0$ and $y>0$ , we have $x+y$
  2. For $x>0$ and $y<0$ , we have $x-y$
  3. For $x<0$ and $y>0$ , we have $-x+y$
  4. For $x<0$ and $y<0$ , we have $-x-y$
  5. observe that the four equations will form a square

Distance of line $y=5$ from $x$ axis is  ____ units.

  1. $-5$

  2. $5$

  3. $10$

  4. $-10$


Correct Option: B
Explanation:

Since, if a line at a distance $a$ from $x$-axis and parallel to $x$-axis it is given by $y=+a$ or $y=-a$
Here line is $y=5$
Distance of given line from $x$-axis is $5$ units.

Distance of the line $x=64$ from the $y$ axis is _____ units

  1. $0$

  2. $-64$

  3. $64$

  4. $32$


Correct Option: C
Explanation:

Since, any line of type $x=a$ is parallel to $y$-axis and at a distance $a$ from $y$-axis.

So, distance of line $x=64$ from y-axis is $64$ units.

$4x-3=0$ is a line parallel to 

  1. $y$ axis

  2. $x$ axis

  3. $y=x$ 

  4. $y=2x$ 


Correct Option: A
Explanation:

Given, $4x-3=0$
$\Rightarrow 4x=3$
$\Rightarrow x=\dfrac 34$
Since, every line of type $x=a$ is parallel to $y$ axis.
So, option A is correct.

A straight line parallel to the $x$-axis has equation 

  1. $x = a$

  2. $y = a$

  3. $y = x$

  4. $y = -x$


Correct Option: B
Explanation:

Let the equation of line be $y=mx+c  ...(1)$
Since, the line is parallel to $x$-axis, so slope of line, $m =0$
So, equation $(1)$ becomes $y=c$
Let the line is at a distance of $a$ from $x$-axis.
$a=c$
$\Rightarrow y=a$

The graph of the equation $x= b$ is also a straight line parallel to _____

  1. $y$-axis

  2. $x$-axis

  3. Cannot be determined

  4. Not Parallel


Correct Option: A
Explanation:

The graph of the equation x = b is always a straight line parallel to y-axis.

The graph of the equation $y = a$ is a straight line parallel to _____

  1. $x$-axis

  2. $y$-axis

  3. Cannot be determined

  4. Not Parallel


Correct Option: A
Explanation:

The graph of the equation y = a is always a straight line parallel to x-axis.