If you mean points of (0, -5) and (-4, 7) then it works out as -3
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The standard form of the equation is 2x - y + 5 = 0
y = -3x + 5
If you mean points of: (4, -7) and (0, 5) then it is y = -3x+5
In general to work out the slope it is: (y1-y2)/(x1-x2) whereas x and y are a pair pf coordinates
Without an equality sign the given expression can't be considered to be a straight line equation. But if you mean: y = 2x-1 then the parallel equation is y = 2x+5