First you need to find the slope of the given equation. Do that by solving the equation for y to put the equation into slope-intercept form, . Then the slope of the line will be the coefficient on the x-term (the part of ).
Once you have determined the slope, use the point-slope form of a line, , with the x- and y-coordinates of the given point
(,) to create the desired equation.
Depending on how your instructor wants to see the answer, you may have to manipulate the derived equation into standard form .