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do you mean find two lines: - one must be parallel to y=9x-3 and pass through (7,-3) - and the other must be perpendicular to that line, and also pass through (7,-3) Please correct me if I have misunderstood the question I'm not going to give you the answer, but I can give you some clues: - Two parallel lines will have the same gradient. - The product of the gradients of two perpendicular lines makes -1, i.e., m1 * m2 = -1 - Substituting the y and x values of a point into an equation can tell you whether the point lies on the line or not, in fact, you can find either the missing gradient or y-intercept if you have a point on that line by substituting in the values of y and x, and then solving the equation for the missing variable.
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