IXL | Horizontal and vertical lines

Look at this graph:

-10

-8

-6

-4

-2

-10

-8

-6

-4

-2

Write the equation of the line.

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Learn with an example

question

Look at this graph:

-10

-8

-6

-4

-2

-10

-8

-6

-4

-2

Write the equation of the line.

key idea

If every point on a line has an x-value of ^–1, then the equation of the line is x = ^–1.

If every point on a line has a y-value of ^–1, then the equation of the line is y = ^–1.

solution

Notice that every point on the graph has a y-value of ^–1:

-10

-8

-6

-4

-2

-10

-8

-6

-4

-2

(^–8, ^–1)

(^–3, ^–1)

(2, ^–1)

(7, ^–1)

Since the y-value is always ^–1, the equation is y = ^–1.

Looking for more? Try these:

Lesson: Linear equations

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O.1Coordinate plane review

Lesson: Linear equations

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