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Math Help - solve for y. plz help me!!

  1. #1
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    Unhappy solve for y. plz help me!!

    solve for y. -2x+3y=9
    whats the parallel line equation?
    whats the perpendicular line?
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  2. #2
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    Quote Originally Posted by b.gilmore View Post
    solve for y. -2x+3y=9
    whats the parallel line equation?
    whats the perpendicular line?
    3y = 9 + 2x \Rightarrow y = \frac{9 + 2x}{3}.

    Once you have solved for y, gradient = coefficient of x.

    Parallel lines have the same gradient.

    The product of the gradients of a pair of perpendicular lines is equal to -1.

    Without further data, the best you can do is express the equation of each required line in the form y = mx + c where m is the gradient (which you can calculate) and c is the y-intercept (for which there is not enough data to get a value of).
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