By Lee Mansfield on the 11th of June, 2012

c represents the y-intercept. This means that the line y=mx+c goes through the point with coordinates (0,c)

Refine By Keith Jones on the 11th of June, 2012

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The general equation for a straight line graph is given by

y = mx + c

Where m is the gradient of the line, and c is the y-intercept.

To understand the gradients of perpendicular straight line graphs you must always remember to find the the slope (gradient) and y intercept.

Suppose we have two equations:

y = m^{1}x^{ }+ c^{1}y = m^{2}x + c^{2}

If m^{1} and m^{2} multiplied together make -1, the two lines are perpendicular, regardless of the rest of the equation.

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