Answer:
Step-by-step explanation: y+9=-3(x-4)......given equation
This equation can be expanded further and simplified
y+9=-3x+12
We want to put the equation into the form y=mx+b so we can read its characteristics
To do this we need to get y on its own. We must take 9 from both sides
y+9-9=-3x-9+12
y=-3x+3
The equation has a gradient or slope or m =-3 and it cuts the y-axis at +3 or is the yintercept