Write an equation for the data values below

x -4 -3 -2 -1
y -1 0 1 2

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  1. x goes up 1 (-4to-3), y goes up 1(-1 to 0)
    x goes up 3(-4 to-1), y goes up 3(-1 to 2)

    change in / change in x = slope = 1

    so y = m x + b with m = 1
    y = x + b
    put in a point (-3,0) is easy
    0 = -3 + b
    b = 3
    y = x + 3

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