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6 September, 16:01

A line passes through (-1, 7) and (2, 10). which answer is the equation of the line?

a. - x y=8-x y=8

b. - 3x y=4-3x y=4

c. - 3x y=16-3x y=16

d.-x y=12

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Answers (1)
  1. 6 September, 16:27
    0
    First you need to find the slope of the line. So what you need to do is y^2-y^1 / x^2-x^1

    (x^1, y^1) (x^2, y^2)

    (-1, 7) (2, 10)

    10-7 / 2 - (-1)

    3/3=1

    slope is 1

    I got 8 as the y intercept. Reason how is that I made a table. And what I did was go back instead of going forward.

    x y

    -1 7

    0 8

    1 9

    2 10

    The answer would be x = 1 y = x + 8 y=8 But the answer choice you listed for A. would not match up the 2 coordinate you gave. Make sure a. should be x = 1 y = x + 8 y=8, not - x y = 8-x y=8
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