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Math Help - Graphs and equations

  1. #1
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    Post Graphs and equations

    Hi again !

    a) A point on the line y=3x-4 has a x-coordinate of 50.
    What is the y-coordinate of this point?

    I did 3x50-4 and go 146 but I think its wrong!

    b) A point on the line y=3x-4 has a y-coordinate of 50.
    What is the x-coordinate of this point?

    I did 50+4 divided by 3 and got 18 but i think thats wrong too

    c) Is the point (-10, -34) on the line y=3x-4? Show how you know

    Thankyou to anyone who can explain this to me !

    Hannah
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by Hannah95 View Post
    Hi again !

    a) A point on the line y=3x-4 has a x-coordinate of 50.
    What is the y-coordinate of this point?

    I did 3x50-4 and go 146 but I think its wrong!
    Hi Hannah,

    Why would you think that? This is correct.

    Quote Originally Posted by Hannah95 View Post
    b) A point on the line y=3x-4 has a y-coordinate of 50.
    What is the x-coordinate of this point?

    I did 50+4 divided by 3 and got 18 but i think thats wrong too
    Come on Hannah, have a little faith. You are doing these correctly.

    Quote Originally Posted by Hannah95 View Post
    c) Is the point (-10, -34) on the line y=3x-4? Show how you know

    Thankyou to anyone who can explain this to me !

    Hannah
    On this one, just plug in the coordinates and see if the statement is true.

    -34=3(-10)-4

    -34=-30-4

    -34=-34
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