How to Find Y in Graphs

Students begin learning how to graph basic math functions as early as elementary school. Graphs have an important application in mathematical functions in providing an image of two equations. This image can help plot out physically where two equations intersect and how two formulas interact. Every graph has two axes, one being X and the other Y. To find Y in graphs, you first need to have your formula or formulas, and then the graph must be drawn or entered into a calculator. From here, finding the Y in the graph is a simple and straightforward process.

Things You'll Need

  • graph
  • pencil
  • equation
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Instructions

    • 1

      Draw a standard graph by having a vertical line intersect a horizontal line to make a large cross. If you are using a calculator, simply use your device's graphing application.

    • 2

      Plot your equation or points on the graph via calculator or paper and pencil. For more complicated equations, it is recommended to use a calculator with graphing capabilities.

    • 3

      Find the X point on the graph. If you have plotted an equation, there should be a line running through the graph. If you have plotted points, there should simply be dots located somewhere on the graph. The x-coordinate is the horizontal line. To find X for a particular point, draw a vertical line to the x-axis. For example, if point F is directly above the x-coordinate plane value of 300, then the x-coordinate of point F equals 300.

    • 4

      Identify the y-coordinate point on the graph. The y-coordinate is the vertical line running through the graph plane.

    • 5

      Measure Y for a particular point. To do this, draw a horizontal line to the y-axis. For example, if point F is located directly to the right of the y-coordinate value of 200, then the y-coordinate of F equals 200.

    • 6

      Write down the coordinates of the given point. To continue with our example of point F, the coordinates should be (300, 200). The x-value is always placed first within the parentheses, and the y-value is always second.

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