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How Do You Use the Vertical Line Test to Figure Out if a Graph is a Function?

Determine whether the graph of the equation y = 2x-2 is a function.

Summary

  1. A function is an equation that never has more than one y-value for any single x-value
  2. Draw the coordinate plane
  3. Graph the line representing y=2x-2
  4. To perform the vertical line test we imagine a vertical line on the left side of the coordinate plane
  5. Then we move the vertical line to the right as far as possible
  6. Since the imaginary vertical line never intersected our line more than once at a time, our equation is a function

Notes

    1. A function is an equation that never has more than one y-value for any single x-value
    1. A function is an equation that never has more than one y-value for any single x-value
    1. A function is an equation that never has more than one y-value for any single x-value
    1. A function is an equation that never has more than one y-value for any single x-value