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How to Find the Slope & Y-Intercept of a Line

Many phenomena in the natural world and the world of human invention can be represented by linear equations. The properties of a line can be described in several different ways, but one of the most common and convenient is by finding the slope and y-intercept. Simple algebraic calculations can help you determine the slope and y-intercept of a line.

Things You'll Need

  • Paper and pencil
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Instructions

    • 1

      Isolate the term with the dependent variable on one side of the equation.

      For example, if the linear equation is 3y + 7x = 15 and y is the dependent variable, then you would rewrite it as 3y = -7x + 15.

    • 2

      Isolate the dependent variable itself.

      In the above example, 3y = -7x + 15 should be divided by 3 on both sides, which leads to y = -7/3x + 5.

    • 3

      Identify the slope and intercept. The standard form is y = mx + b. In that equation, m is the slope and b is the y-intercept.

      In the equation y = -7/3x + 5, m is -7/3 and b is 5. That is, the slope is -7/3 and the y-intercept is 5.

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