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Math Help - [SOLVED] Straight line graph

  1. #1
    Member helloying's Avatar
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    [SOLVED] Straight line graph

    It is known that x and y are related by the eqn of the form y=x-ax+b where a and b are constant. Express this eqn in a form suitable for plotting a straight line graph.I am suppose to plot the graph to find value of a and b. I dont know what shld I plot against to get a straight line graph
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  2. #2
    Junior Member
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    Quote Originally Posted by helloying View Post
    It is known that x and y are related by the eqn of the form y=x-ax+b where a and b are constant. Express this eqn in a form suitable for plotting a straight line graph.I am suppose to plot the graph to find value of a and b. I dont know what shld I plot against to get a straight line graph
    Hello

    Probably too late, but here is one way.

     y-x^2 = -ax + b

    Subtract x^2 from the corresponding values of y, then plot these against x. Find the gradient (a) and the y intercept (b) of the line.

    I know that might not be very clear. If you have the values of x and y, then I'll show you. There are a number of other ways to find the values of a and b too.

    Hope that helps.
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