given points are (0,4) (1,1)
slope (m) = (y2-y1)/(x2-x1)
m = 1-4 / 1-0
= -3
slope-intercept formula
y = mx + b
y = -3x + b
use any point to find b lets use (0,4)
4 = 0 + b
b = 4
y= -3x + 4
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