Question

How do you graph the inequality $y > - 1$ ?

Answer 1

First we need to draw the graph of the equation$y = - 1$ . We use intercept form to draw the graph. That is we find the coordinate of the given equation lying on the line of x- axis, we can find this by substituting the value of ‘y’ is equal to zero (x-intercept). Similarly we can find the coordinate of the equation lying on the line of y- axis, we can find this by substituting the value of ‘x’ equal to zero (y-intercept). After drawing the graph we can check in which region the inequality satisfies. Here if we draw $y > - 1$ we will have a parallel line to x-axis.

Complete step by step answer:
Given, $y > - 1$. Now consider $y = - 1$.
For $y = - 1$.
Here we don’t have an ‘x’ variable in the given equation. So ‘y’ will always equal to $- 1$, no matter what value we put in for ‘x’, the ‘y’ is always going to be $- 1$. That is,

$x$	$1$	$- 1$	$2$	$- 2$	$3$	$- 3$	$4$	$- 4$
$y$	$- 1$	$- 1$	$- 1$	$- 1$	$- 1$	$- 1$	$- 1$	$- 1$

Let’s plot a graph for these coordinates. We take scale x-axis= 1 unit = 1 units and y-axis= 1 unit = 1 units.

We expanded the point touching the intercepts. We took a coordinate above and below the equation of line (see in above graph).For $y > - 1$, we can see in the graph that we have a straight horizontal line that crosses the y axis at $- 1$. The solution is all the coordinate points above the line $y = - 1$. If we take coordinate points below the line the inequality won’t be satisfied. In the above graph the shaded region is the solution of the given inequality.

Note: We don’t take points lying on the line $y = - 1$ for the inequality $y > - 1$. 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.