im a bit late but its rise over run for gradient, (y2-y1)/(x2-x1)
in this case it would be (0-4)/(8-3) = -4/5 for m in y = mx + b
substitute points in to get 4 = -4/5*3 + b, or 0 = -4/5*8 + b
then just solve it to get b, this will give you the full equation for that line
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