SOLUTION: PLEASE HELP!! Line a is perpendicular to a line thats perpendicular to a line whose equation is 3x-7y=-3. If all lines are in the same plane whats the slope of line a.

Question 130423: PLEASE HELP!! Line a is perpendicular to a line thats perpendicular to a line whose equation is 3x-7y=-3. If all lines are in the same plane whats the slope of line a.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Lines are perpendicular if and only if their slopes are negative reciprocals of each other, that is . All you have to do is put the given equation into slope-intercept form by solving the equation for y. Once you have done that, the coefficient on x will be the slope of the given line. Take the negative reciprocal (turn the fraction over and put a minus sign in front of it) and you have your answer.
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