Question

How do you graph $y - 4x = 0$ by plotting points?

Answer 1

Hint: We are given a linear equation in terms of two variable quantities namely x and y and we have to graph it. On putting random values of x, we can get random values of y and thus find the coordinates of one of the points lying on the line. To plot the graph of a straight line we must know the coordinates of at least two points lying on the line so we put the value of both x and y zero one by one and then find the value of other variables from the equation of the line. We can obtain the line on the graph by joining these points.

Complete step by step solution:
The equation of the line is $y - 4x = 0$
When $x = 0$
$
  y - 4(0) = 0 \\
   \Rightarrow y = 0 \;
 $
Thus the line passes through the origin.
When $x = 1$
$
  y - 4(1) = 0 \\
   \Rightarrow y = 4 \;
 $
We can trace the line of the equation $y - 4x = 0$ by joining these two points and then extending the obtained line away in the opposite directions.

Note: A graph shows the relation between two variable quantities, it contains two axes perpendicular to each other namely the x-axis and the y-axis. Each variable is measured along one of the axes. In the question, we are given one linear equation containing two variables namely x and y, x is measured along the x-axis and y is measured along the y-axis while tracing the given equations. To find the equation of a line, we must know the coordinates of at least two of the points lying on the line. We are given the equation of a line in the question so we had to find the coordinates using the given equation.