Answer: The equation in slope intercept y=mx+b is y=-9x-3
Step-by-step explanation: The slope is (M) in the eqaution. And if it says the slope is -9, than you would write it next as y=-9x (+,-) depending on sign. Coordinates are in X,Y format so (1) is x-intercept and (-3) is y intercept or b in the equation. There is slope-intercept, point-slope, and standard form. If you need help with converting to a different eqaution type ask another question for that specific and I or someone else can help you.,
Hope this helps!.