`y=9-3x`

m=__________

b=___________

`y=9-3x`

m=__________

b=___________

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y=mx+b the 'm' is always connected to the 'x'

your equation is just written as

y=b-mx or you can move things around

y=-mx+b

solution: y=-3x+9

m(which is slope) = -3

b= 9

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