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 = m1x + c1
y = m2x + c2

If m1 and m2 multiplied together make -1, the two lines are perpendicular, regardless of the rest of the equation.

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