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The slope intercept form is: y=mx+b where m is the slope and b is the y-intercept.

Since you already know the slope, you can plug that into the equation.

y=-3x+b

The only thing left to do is to find out what b is. To do this, plug the x and y value of the point it goes through into the equation and solve for b. Good luck.

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Q: What is the slope intercept form of the line that has a slope of negative 3 and contains the points of 4 and negative 5?
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