Step 1. Put your equation into slope-intercept form by solving for in terms of , i.e. make it look like:
Step 2. Determine the slope of the given line by inspection of the coefficient on in the result from step 1.
Step 3. Use:
to determine the slope of the desired line, i.e. find the negative reciprocal of the slope determined in step 2.
Step 4. Create the equation of the desired line by use of the point-slope form of the equation of a line:
where is the slope calculated in step 3, and is the given point.
Step 5. Arrange the equation into the form required by your assignment or instructor's instructions. However, since the question states "find an equation..." the result of step 4 is just as valid as any other form of the equation.
