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Math Help - Questions about lines

  1. #1
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    Questions about lines

    ahh thanks! umm i actually have two more questions (sorry!)

    um a) caculate the x and y intercept of the staright line with the equation 3x-2y=9

    and

    b) transpose the equation 3y+7=5x+4 into y=mx+c form.
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  2. #2
    Member u2_wa's Avatar
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    y=mx+c

    Quote Originally Posted by coldplayroxs View Post
    ahh thanks! umm i actually have two more questions (sorry!)

    um a) caculate the x and y intercept of the staright line with the equation 3x-2y=9

    and

    b) transpose the equation 3y+7=5x+4 into y=mx+c form.
    a) 3x-9=2y; at x-intercept y=0;
    so 3x-9=0 & x=3
    At y-intercept x=0 so -9=2y & y=-9/2

    b) 3y+3=5x & y=5x/3 - 1
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  3. #3
    Senior Member mollymcf2009's Avatar
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    Quote Originally Posted by coldplayroxs View Post
    ahh thanks! umm i actually have two more questions (sorry!)

    um a) caculate the x and y intercept of the staright line with the equation 3x-2y=9

    and

    b) transpose the equation 3y+7=5x+4 into y=mx+c form.
    Whenever you have a line and you want to find the x & y intercepts, you can plug zero in for y to solve for the x intercept (which is where y would equal zero) and zero in for x to find the y intercept.

    For part b, just solve for y. This is simple algebra:

    3y + 7 = 5x + 4

    3y = 5x - 3

    y = \frac{5}{3}x - 1
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