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slope = 2-(-4)/-2-0 = 2+4/-2 = 6/-2 = - 3

So y=-3x+b

Substitute the coordinate (0,-4) -4=-3(0)+b, -4=0+b, -4=b, y intercept is -4

Substitute that for b y=-3x-4

So the answer is

y=-3x-4

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