Graph y=-|x-3|

$y = - | x - 3 |$

Step 1

Find the absolute value vertex. In this case, the vertex for $y = - | x - 3 |$ is $(3, 0)$ .

To find the $x$ coordinate of the vertex, set the inside of the absolute value $x - 3$ equal to $0$ . In this case, $x - 3 = 0$ .

$x - 3 = 0$

Add $3$ to both sides of the equation.

$x = 3$

Replace the variable $x$ with $3$ in the expression.

$y = - | (3) - 3 |$

Simplify $- | (3) - 3 |$ .

Subtract $3$ from $3$ .

$y = - | 0 |$

The absolute value is the distance between a number and zero. The distance between $0$ and $0$ is $0$ .

$y = - 0$

Multiply $- 1$ by $0$ .

$y = 0$

The absolute value vertex is $(3, 0)$ .

$(3, 0)$

Step 2

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

$(- \infty, \infty)$

Set-Builder Notation:

${x | x \in ℝ}$

Step 3

For each $x$ value, there is one $y$ value. Select a few $x$ values from the domain. It would be more useful to select the values so that they are around the $x$ value of the absolute value vertex.

Substitute the $x$ value $1$ into $f (x) = - | x - 3 |$ . In this case, the point is $(1, - 2)$ .

Replace the variable $x$ with $1$ in the expression.

$f (1) = - | (1) - 3 |$

Simplify the result.

Subtract $3$ from $1$ .

$f (1) = - | - 2 |$

The absolute value is the distance between a number and zero. The distance between $- 2$ and $0$ is $2$ .

$f (1) = - 1 \cdot 2$

Multiply $- 1$ by $2$ .

$f (1) = - 2$

The final answer is $- 2$ .

$y = - 2$

Substitute the $x$ value $2$ into $f (x) = - | x - 3 |$ . In this case, the point is $(2, - 1)$ .

Replace the variable $x$ with $2$ in the expression.

$f (2) = - | (2) - 3 |$

Simplify the result.

Subtract $3$ from $2$ .

$f (2) = - | - 1 |$

The absolute value is the distance between a number and zero. The distance between $- 1$ and $0$ is $1$ .

$f (2) = - 1 \cdot 1$

Multiply $- 1$ by $1$ .

$f (2) = - 1$

The final answer is $- 1$ .

$y = - 1$

Substitute the $x$ value $5$ into $f (x) = - | x - 3 |$ . In this case, the point is $(5, - 2)$ .

Replace the variable $x$ with $5$ in the expression.

$f (5) = - | (5) - 3 |$

Simplify the result.

Subtract $3$ from $5$ .

$f (5) = - | 2 |$

The absolute value is the distance between a number and zero. The distance between $0$ and $2$ is $2$ .

$f (5) = - 1 \cdot 2$

Multiply $- 1$ by $2$ .

$f (5) = - 2$

The final answer is $- 2$ .

$y = - 2$

The absolute value can be graphed using the points around the vertex $(3, 0), (1, - 2), (2, - 1), (4, - 1), (5, - 2)$

$\begin{array}{c} x & y \\ 1 & - 2 \\ 2 & - 1 \\ 3 & 0 \\ 4 & - 1 \\ 5 & - 2 \end{array}$

Step 4

Graph y=-|x-3|

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