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Algebra -How To Determine the Equation of a Straight Line

Given a straignt line on a graph, how do you determine the equation for this line?

We know that a straight line is of the form y = mx + c – this means that what we need to find out is the 2 constants ‘m‘ and ‘c‘.

So how is this done?

Well! in a previous post, we looked at how to plot a linear equation on a graph using the slope and y-intercept mehod. In this article, we will be doing the reverse process; which is:

  • Finding the y-intercept – this will give us constant ‘c‘ in the equation, and
  • Finding the slope of the line – which will give us constant ‘m‘ in the equation.

Watch this video for an example.