Algebra-Please check _i forgot a point last night

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Equation of line with slope m = -3 and including point (5,5) is y = - 3x+20

I think its true when I worked it out
I figured out the slope and put in the points
y-5 = - 3(x-5)
y = -3x + 15
y = -3x + 15 + 5
y = -3x + 20

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