math

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a company was charged $290 for 13 frames. it was charged $430 for 20 frames.
A. use the coordinates (13,290) and (20,430) to write a linear equation in point slope form that gives the relationship of the cost to the number of frames
B. find the cost for 25 frames.

  • math -

    You have posted 5 questions that are done the same way. I will do this one, and you do the previous 4

    slope between the two points (13,290) and (20,430)
    = (430-290)/(20-13) = 140/7 = 20

    equation:
    y-290 = 20(x-13)

    arrange it in any way you want.
    e.g.
    y = 20x - 260 + 290
    y = 20x + 30 would be the slope-yintercept form

  • math -

    What is the answer for B

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