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Math Help - The equation for a straight line

  1. #1
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    The equation for a straight line

    Sorry if this is in the wrong section I am not sure what this is categorized as. I have a problem regarding the equation for a straight line. I have the following question and solution but im really not sure if I am right to drop the units. Could anyone help please?

    The equation for a straight line is often used in science to find an unknown without reference to a graph. For a set of data for two quatities, A and B, where A is plotted on the x-axis and B on the y-axis, the gradient of the straight line is 2.3 104m s−1 and the intercept on the y-axis is 5.8 104 m. Using the equation for a straight line (Book 3, Equation 7.12 ) as your starting point, determine the value for A when B = 6.2 105 m. Show all your workings and give your answer in scientific notation and to two significant figures.
    Y =mx + c

    C = 5.8 104 m
    M= 2.3 104m s−1
    B = 6.2 105 m

    6.2 105 = 2.3 104 A + 5.8 104
    6.2 105 - 5.8 104 = 2.3 104 A
    620000 58000= 23000 A
    562000 = 23000 A

    562000
    = A
    23000

    24.434782608695652173913043478261 = A
    A = 24 to 2 significant figures.
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  2. #2
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    Re: The equation for a straight line

    What seems to be the trouble? You've done everything correctly...
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  3. #3
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    Re: The equation for a straight line

    I just wanted to check i am correct in dropping all of the units from the equation? would i need to put some back on to the end for my A value?
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